diff --git a/bin/reth/src/test_eth_chain/runner.rs b/bin/reth/src/test_eth_chain/runner.rs
index f95ecfd0b..be2f1c64a 100644
--- a/bin/reth/src/test_eth_chain/runner.rs
+++ b/bin/reth/src/test_eth_chain/runner.rs
@@ -174,7 +174,7 @@ pub async fn run_test(path: PathBuf) -> eyre::Result<TestOutcome> {
 
         let storage = db.view(|tx| -> Result<_, DbError> {
             let mut cursor = tx.cursor_dup_read::<tables::PlainStorageState>()?;
-            let walker = cursor.first()?.map(|first| cursor.walk(first.0)).transpose()?;
+            let walker = cursor.first()?.map(|first| cursor.walk(Some(first.0))).transpose()?;
             Ok(walker.map(|mut walker| {
                 let mut map: HashMap<Address, HashMap<U256, U256>> = HashMap::new();
                 while let Some(Ok((address, slot))) = walker.next() {
@@ -210,7 +210,7 @@ pub async fn run_test(path: PathBuf) -> eyre::Result<TestOutcome> {
             }
             Some(RootOrState::State(state)) => db.view(|tx| -> eyre::Result<()> {
                 let mut cursor = tx.cursor_dup_read::<tables::PlainStorageState>()?;
-                let walker = cursor.first()?.map(|first| cursor.walk(first.0)).transpose()?;
+                let walker = cursor.first()?.map(|first| cursor.walk(Some(first.0))).transpose()?;
                 let storage = walker.map(|mut walker| {
                     let mut map: HashMap<Address, HashMap<U256, U256>> = HashMap::new();
                     while let Some(Ok((address, slot))) = walker.next() {
diff --git a/crates/stages/src/db.rs b/crates/stages/src/db.rs
index 7a8c99ed6..7152b0038 100644
--- a/crates/stages/src/db.rs
+++ b/crates/stages/src/db.rs
@@ -199,7 +199,7 @@ where
         T2: Table<Key = T1::Value>,
     {
         let mut cursor = self.cursor_write::<T1>()?;
-        let mut walker = cursor.walk(start_at)?;
+        let mut walker = cursor.walk(Some(start_at))?;
         while let Some((_, value)) = walker.next().transpose()? {
             self.delete::<T2>(value, None)?;
         }
diff --git a/crates/stages/src/stages/bodies.rs b/crates/stages/src/stages/bodies.rs
index 1419a4570..dc230d896 100644
--- a/crates/stages/src/stages/bodies.rs
+++ b/crates/stages/src/stages/bodies.rs
@@ -619,7 +619,8 @@ mod tests {
 
                     let mut prev_number: Option<BlockNumber> = None;
                     let mut expected_transition_id = 0;
-                    for entry in bodies_cursor.walk(first_body_key)? {
+
+                    for entry in bodies_cursor.walk(Some(first_body_key))? {
                         let (number, body) = entry?;
 
                         // Validate sequentiality only after prev progress,
diff --git a/crates/stages/src/stages/execution.rs b/crates/stages/src/stages/execution.rs
index 717a69952..edab82fb8 100644
--- a/crates/stages/src/stages/execution.rs
+++ b/crates/stages/src/stages/execution.rs
@@ -115,7 +115,7 @@ impl ExecutionStage {
             tracing::trace!(target: "sync::stages::execution", ?block_number, "Execute block.");
 
             // iterate over all transactions
-            let mut tx_walker = tx_cursor.walk(body.start_tx_id)?;
+            let mut tx_walker = tx_cursor.walk(Some(body.start_tx_id))?;
             let mut transactions = Vec::with_capacity(body.tx_count as usize);
             // get next N transactions.
             for index in body.tx_id_range() {
@@ -129,7 +129,7 @@ impl ExecutionStage {
             }
 
             // take signers
-            let mut tx_sender_walker = tx_sender.walk(body.start_tx_id)?;
+            let mut tx_sender_walker = tx_sender.walk(Some(body.start_tx_id))?;
             let mut signers = Vec::with_capacity(body.tx_count as usize);
             for index in body.tx_id_range() {
                 let (tx_index, tx) = tx_sender_walker
@@ -198,7 +198,7 @@ impl ExecutionStage {
                     if wipe_storage {
                         // iterate over storage and save them before entry is deleted.
                         tx.cursor_read::<tables::PlainStorageState>()?
-                            .walk(address)?
+                            .walk(Some(address))?
                             .take_while(|res| {
                                 res.as_ref().map(|(k, _)| *k == address).unwrap_or_default()
                             })
diff --git a/crates/stages/src/stages/hashing_account.rs b/crates/stages/src/stages/hashing_account.rs
index 566d14039..3911c0500 100644
--- a/crates/stages/src/stages/hashing_account.rs
+++ b/crates/stages/src/stages/hashing_account.rs
@@ -7,7 +7,7 @@ use reth_db::{
     tables,
     transaction::{DbTx, DbTxMut},
 };
-use reth_primitives::{keccak256, Account, Address, H160};
+use reth_primitives::{keccak256, Account, Address};
 use std::{
     collections::{BTreeMap, BTreeSet},
     fmt::Debug,
@@ -63,7 +63,7 @@ impl<DB: Database> Stage<DB> for AccountHashingStage {
             tx.clear::<tables::HashedAccount>()?;
             tx.commit()?;
 
-            let mut first_key = H160::zero();
+            let mut first_key = None;
             loop {
                 let next_key = {
                     let mut accounts = tx.cursor_read::<tables::PlainAccountState>()?;
@@ -85,7 +85,7 @@ impl<DB: Database> Stage<DB> for AccountHashingStage {
                 };
                 tx.commit()?;
                 if let Some((next_key, _)) = next_key {
-                    first_key = next_key;
+                    first_key = Some(next_key);
                     continue
                 }
                 break
diff --git a/crates/stages/src/stages/hashing_storage.rs b/crates/stages/src/stages/hashing_storage.rs
index a1ec03fc7..76289d2bb 100644
--- a/crates/stages/src/stages/hashing_storage.rs
+++ b/crates/stages/src/stages/hashing_storage.rs
@@ -8,7 +8,7 @@ use reth_db::{
     tables,
     transaction::{DbTx, DbTxMut},
 };
-use reth_primitives::{keccak256, Address, StorageEntry, H160, H256, U256};
+use reth_primitives::{keccak256, Address, StorageEntry, H256, U256};
 use std::{
     collections::{BTreeMap, BTreeSet},
     fmt::Debug,
@@ -63,7 +63,7 @@ impl<DB: Database> Stage<DB> for StorageHashingStage {
             tx.clear::<tables::HashedStorage>()?;
             tx.commit()?;
 
-            let mut first_key = H160::zero();
+            let mut first_key = None;
             loop {
                 let next_key = {
                     let mut storage = tx.cursor_dup_read::<tables::PlainStorageState>()?;
@@ -92,7 +92,7 @@ impl<DB: Database> Stage<DB> for StorageHashingStage {
                 tx.commit()?;
 
                 first_key = match next_key {
-                    Some(key) => key,
+                    Some(key) => Some(key),
                     None => break,
                 };
             }
@@ -413,8 +413,7 @@ mod tests {
                         );
                         expected += 1;
                     }
-                    let count =
-                        tx.cursor_dup_read::<tables::HashedStorage>()?.walk(H256::zero())?.count();
+                    let count = tx.cursor_dup_read::<tables::HashedStorage>()?.walk(None)?.count();
 
                     assert_eq!(count, expected);
                     Ok(())
diff --git a/crates/stages/src/stages/index_account_history.rs b/crates/stages/src/stages/index_account_history.rs
index 15a3c31a5..b240a95b9 100644
--- a/crates/stages/src/stages/index_account_history.rs
+++ b/crates/stages/src/stages/index_account_history.rs
@@ -59,7 +59,7 @@ impl<DB: Database> Stage<DB> for IndexAccountHistoryStage {
 
         let account_changesets = tx
             .cursor_read::<tables::AccountChangeSet>()?
-            .walk(from_transition)?
+            .walk(Some(from_transition))?
             .take_while(|res| res.as_ref().map(|(k, _)| *k < to_transition).unwrap_or_default())
             .collect::<Result<Vec<_>, _>>()?;
 
@@ -122,7 +122,7 @@ impl<DB: Database> Stage<DB> for IndexAccountHistoryStage {
 
         let account_changeset = tx
             .cursor_read::<tables::AccountChangeSet>()?
-            .walk(from_transition_rev)?
+            .walk(Some(from_transition_rev))?
             .take_while(|res| res.as_ref().map(|(k, _)| *k < to_transition_rev).unwrap_or_default())
             .collect::<Result<Vec<_>, _>>()?;
 
diff --git a/crates/stages/src/stages/index_storage_history.rs b/crates/stages/src/stages/index_storage_history.rs
index 704defb76..2afde1a47 100644
--- a/crates/stages/src/stages/index_storage_history.rs
+++ b/crates/stages/src/stages/index_storage_history.rs
@@ -59,7 +59,7 @@ impl<DB: Database> Stage<DB> for IndexStorageHistoryStage {
 
         let storage_chageset = tx
             .cursor_read::<tables::StorageChangeSet>()?
-            .walk((from_transition, Address::zero()).into())?
+            .walk(Some((from_transition, Address::zero()).into()))?
             .take_while(|res| {
                 res.as_ref().map(|(k, _)| k.transition_id() < to_transition).unwrap_or_default()
             })
@@ -128,7 +128,7 @@ impl<DB: Database> Stage<DB> for IndexStorageHistoryStage {
 
         let storage_changesets = tx
             .cursor_read::<tables::StorageChangeSet>()?
-            .walk((from_transition_rev, Address::zero()).into())?
+            .walk(Some((from_transition_rev, Address::zero()).into()))?
             .take_while(|res| {
                 res.as_ref().map(|(k, _)| k.transition_id() < to_transition_rev).unwrap_or_default()
             })
diff --git a/crates/stages/src/stages/total_difficulty.rs b/crates/stages/src/stages/total_difficulty.rs
index 6e00d52c0..24cd27ed6 100644
--- a/crates/stages/src/stages/total_difficulty.rs
+++ b/crates/stages/src/stages/total_difficulty.rs
@@ -65,7 +65,7 @@ impl<DB: Database> Stage<DB> for TotalDifficultyStage {
         debug!(target: "sync::stages::total_difficulty", ?td, block_number = last_header_number, "Last total difficulty entry");
 
         let walker = cursor_headers
-            .walk(start_block)?
+            .walk(Some(start_block))?
             .take_while(|e| e.as_ref().map(|(_, h)| h.number <= end_block).unwrap_or_default());
         // Walk over newly inserted headers, update & insert td
         for entry in walker {
diff --git a/crates/stages/src/stages/tx_lookup.rs b/crates/stages/src/stages/tx_lookup.rs
index a3808bab4..7263a8a91 100644
--- a/crates/stages/src/stages/tx_lookup.rs
+++ b/crates/stages/src/stages/tx_lookup.rs
@@ -58,7 +58,7 @@ impl<DB: Database> Stage<DB> for TransactionLookupStage {
         let mut tx_cursor = tx.cursor_write::<tables::Transactions>()?;
 
         // Walk over block bodies within a specified range.
-        let bodies = cursor_bodies.walk(start_block)?.take_while(|entry| {
+        let bodies = cursor_bodies.walk(Some(start_block))?.take_while(|entry| {
             entry.as_ref().map(|(num, _)| *num <= end_block).unwrap_or_default()
         });
 
@@ -66,7 +66,7 @@ impl<DB: Database> Stage<DB> for TransactionLookupStage {
         let mut tx_list = vec![];
         for body_entry in bodies {
             let (_, body) = body_entry?;
-            let transactions = tx_cursor.walk(body.start_tx_id)?.take(body.tx_count as usize);
+            let transactions = tx_cursor.walk(Some(body.start_tx_id))?.take(body.tx_count as usize);
 
             for tx_entry in transactions {
                 let (id, transaction) = tx_entry?;
diff --git a/crates/stages/src/test_utils/test_db.rs b/crates/stages/src/test_utils/test_db.rs
index 0ce309340..25aac890e 100644
--- a/crates/stages/src/test_utils/test_db.rs
+++ b/crates/stages/src/test_utils/test_db.rs
@@ -85,7 +85,9 @@ impl TestTransaction {
         T::Key: Default + Ord,
     {
         self.query(|tx| {
-            tx.cursor_read::<T>()?.walk(T::Key::default())?.collect::<Result<Vec<_>, DbError>>()
+            tx.cursor_read::<T>()?
+                .walk(Some(T::Key::default()))?
+                .collect::<Result<Vec<_>, DbError>>()
         })
     }
 
diff --git a/crates/stages/src/trie/mod.rs b/crates/stages/src/trie/mod.rs
index 45542aa20..be1f30501 100644
--- a/crates/stages/src/trie/mod.rs
+++ b/crates/stages/src/trie/mod.rs
@@ -203,7 +203,7 @@ impl DBTrieLoader {
         tx.clear::<tables::StoragesTrie>()?;
 
         let mut accounts_cursor = tx.cursor_read::<tables::HashedAccount>()?;
-        let mut walker = accounts_cursor.walk(H256::zero())?;
+        let mut walker = accounts_cursor.walk(None)?;
 
         let db = Arc::new(HashDatabase::new(tx)?);
 
diff --git a/crates/storage/db/benches/criterion.rs b/crates/storage/db/benches/criterion.rs
index d1df4a0d2..0a814cd06 100644
--- a/crates/storage/db/benches/criterion.rs
+++ b/crates/storage/db/benches/criterion.rs
@@ -174,7 +174,7 @@ where
 
             black_box({
                 let mut cursor = tx.cursor_read::<T>().expect("cursor");
-                let walker = cursor.walk(input.first().unwrap().0.clone()).unwrap();
+                let walker = cursor.walk(Some(input.first().unwrap().0.clone())).unwrap();
                 for element in walker {
                     element.unwrap();
                 }
@@ -264,9 +264,7 @@ where
 
             black_box({
                 let mut cursor = tx.cursor_dup_read::<T>().expect("cursor");
-                let walker = cursor
-                    .walk_dup(input.first().unwrap().0.clone(), T::SubKey::default())
-                    .unwrap();
+                let walker = cursor.walk_dup(None, Some(T::SubKey::default())).unwrap();
                 for element in walker {
                     element.unwrap();
                 }
diff --git a/crates/storage/db/src/abstraction/cursor.rs b/crates/storage/db/src/abstraction/cursor.rs
index f56458db9..39e38c372 100644
--- a/crates/storage/db/src/abstraction/cursor.rs
+++ b/crates/storage/db/src/abstraction/cursor.rs
@@ -30,10 +30,12 @@ pub trait DbCursorRO<'tx, T: Table> {
     /// Returns the current `(key, value)` pair of the cursor.
     fn current(&mut self) -> PairResult<T>;
 
-    /// Returns an iterator starting at a key greater or equal than `start_key`.
+    /// Returns an iterator that walks through the table. If `start_key`
+    /// is None, starts from the first entry of the table. If it not, starts at a key
+    /// greater or equal than the key value wrapped inside Some().
     fn walk<'cursor>(
         &'cursor mut self,
-        start_key: T::Key,
+        start_key: Option<T::Key>,
     ) -> Result<Walker<'cursor, 'tx, T, Self>, Error>
     where
         Self: Sized;
@@ -76,8 +78,8 @@ pub trait DbDupCursorRO<'tx, T: DupSort> {
     /// table.
     fn walk_dup<'cursor>(
         &'cursor mut self,
-        key: T::Key,
-        subkey: T::SubKey,
+        key: Option<T::Key>,
+        subkey: Option<T::SubKey>,
     ) -> Result<DupWalker<'cursor, 'tx, T, Self>, Error>
     where
         Self: Sized;
diff --git a/crates/storage/db/src/abstraction/mock.rs b/crates/storage/db/src/abstraction/mock.rs
index 23ab62f66..7a68ea870 100644
--- a/crates/storage/db/src/abstraction/mock.rs
+++ b/crates/storage/db/src/abstraction/mock.rs
@@ -132,7 +132,7 @@ impl<'tx, T: Table> DbCursorRO<'tx, T> for CursorMock {
 
     fn walk<'cursor>(
         &'cursor mut self,
-        _start_key: T::Key,
+        _start_key: Option<T::Key>,
     ) -> Result<Walker<'cursor, 'tx, T, Self>, Error>
     where
         Self: Sized,
@@ -184,8 +184,8 @@ impl<'tx, T: DupSort> DbDupCursorRO<'tx, T> for CursorMock {
 
     fn walk_dup<'cursor>(
         &'cursor mut self,
-        _key: <T>::Key,
-        _subkey: <T as DupSort>::SubKey,
+        _key: Option<<T>::Key>,
+        _subkey: Option<<T as DupSort>::SubKey>,
     ) -> Result<DupWalker<'cursor, 'tx, T, Self>, Error>
     where
         Self: Sized,
diff --git a/crates/storage/db/src/implementation/mdbx/cursor.rs b/crates/storage/db/src/implementation/mdbx/cursor.rs
index 95d1aa0f8..5e9d5b1f1 100644
--- a/crates/storage/db/src/implementation/mdbx/cursor.rs
+++ b/crates/storage/db/src/implementation/mdbx/cursor.rs
@@ -11,7 +11,7 @@ use crate::{
     tables::utils::*,
     Error,
 };
-use reth_libmdbx::{self, TransactionKind, WriteFlags, RO, RW};
+use reth_libmdbx::{self, Error as MDBXError, TransactionKind, WriteFlags, RO, RW};
 
 /// Alias type for a `(key, value)` result coming from a cursor.
 pub type PairResult<T> = Result<Option<(<T as Table>::Key, <T as Table>::Value)>, Error>;
@@ -75,16 +75,19 @@ impl<'tx, K: TransactionKind, T: Table> DbCursorRO<'tx, T> for Cursor<'tx, K, T>
 
     fn walk<'cursor>(
         &'cursor mut self,
-        start_key: T::Key,
+        start_key: Option<T::Key>,
     ) -> Result<Walker<'cursor, 'tx, T, Self>, Error>
     where
         Self: Sized,
     {
-        let start = self
-            .inner
-            .set_range(start_key.encode().as_ref())
-            .map_err(|e| Error::Read(e.into()))?
-            .map(decoder::<T>);
+        let start = if let Some(start_key) = start_key {
+            self.inner
+                .set_range(start_key.encode().as_ref())
+                .map_err(|e| Error::Read(e.into()))?
+                .map(decoder::<T>)
+        } else {
+            self.first().transpose()
+        };
 
         Ok(Walker::new(self, start))
     }
@@ -112,17 +115,15 @@ impl<'tx, K: TransactionKind, T: Table> DbCursorRO<'tx, T> for Cursor<'tx, K, T>
     where
         Self: Sized,
     {
-        if let Some(start_key) = start_key {
-            let start = self
-                .inner
+        let start = if let Some(start_key) = start_key {
+            self.inner
                 .set_range(start_key.encode().as_ref())
                 .map_err(|e| Error::Read(e.into()))?
-                .map(decoder::<T>);
+                .map(decoder::<T>)
+        } else {
+            self.last().transpose()
+        };
 
-            return Ok(ReverseWalker::new(self, start))
-        }
-
-        let start = self.last().transpose();
         Ok(ReverseWalker::new(self, start))
     }
 }
@@ -155,20 +156,50 @@ impl<'tx, K: TransactionKind, T: DupSort> DbDupCursorRO<'tx, T> for Cursor<'tx,
             .transpose()
     }
 
-    /// Returns an iterator starting at a key greater or equal than `start_key` of a DUPSORT table.
+    /// Depending on its arguments, returns an iterator starting at:
+    /// - Some(key), Some(subkey): a `key` item whose data is >= than `subkey`
+    /// - Some(key), None: first item of a specified `key`
+    /// - None, Some(subkey): like first case, but in the first key
+    /// - None, None: first item in the table
+    /// of a DUPSORT table.
     fn walk_dup<'cursor>(
         &'cursor mut self,
-        key: T::Key,
-        subkey: T::SubKey,
+        key: Option<T::Key>,
+        subkey: Option<T::SubKey>,
     ) -> Result<DupWalker<'cursor, 'tx, T, Self>, Error> {
-        // encode key and decode it after.
-        let key = key.encode().as_ref().to_vec();
+        let start = match (key, subkey) {
+            (Some(key), Some(subkey)) => {
+                // encode key and decode it after.
+                let key = key.encode().as_ref().to_vec();
 
-        let start = self
-            .inner
-            .get_both_range(key.as_ref(), subkey.encode().as_ref())
-            .map_err(|e| Error::Read(e.into()))?
-            .map(|val| decoder::<T>((Cow::Owned(key), val)));
+                self.inner
+                    .get_both_range(key.as_ref(), subkey.encode().as_ref())
+                    .map_err(|e| Error::Read(e.into()))?
+                    .map(|val| decoder::<T>((Cow::Owned(key), val)))
+            }
+            (Some(key), None) => {
+                let key = key.encode().as_ref().to_vec();
+
+                self.inner
+                    .set(key.as_ref())
+                    .map_err(|e| Error::Read(e.into()))?
+                    .map(|val| decoder::<T>((Cow::Owned(key), val)))
+            }
+            (None, Some(subkey)) => {
+                if let Some((key, _)) = self.first()? {
+                    let key = key.encode().as_ref().to_vec();
+
+                    self.inner
+                        .get_both_range(key.as_ref(), subkey.encode().as_ref())
+                        .map_err(|e| Error::Read(e.into()))?
+                        .map(|val| decoder::<T>((Cow::Owned(key), val)))
+                } else {
+                    let err_code = MDBXError::to_err_code(&MDBXError::NotFound);
+                    Some(Err(Error::Read(err_code)))
+                }
+            }
+            (None, None) => self.first().transpose(),
+        };
 
         Ok(DupWalker::<'cursor, 'tx, T, Self> { cursor: self, start, _tx_phantom: PhantomData {} })
     }
diff --git a/crates/storage/db/src/implementation/mdbx/mod.rs b/crates/storage/db/src/implementation/mdbx/mod.rs
index 597992a94..cc017bc5c 100644
--- a/crates/storage/db/src/implementation/mdbx/mod.rs
+++ b/crates/storage/db/src/implementation/mdbx/mod.rs
@@ -211,7 +211,7 @@ mod tests {
         assert!(first.is_some(), "First should be our put");
 
         // Walk
-        let walk = cursor.walk(key).unwrap();
+        let walk = cursor.walk(Some(key.into())).unwrap();
         let first = walk.into_iter().next().unwrap().unwrap();
         assert_eq!(first.1, value, "First next should be put value");
     }
@@ -363,7 +363,7 @@ mod tests {
         // Confirm the result
         let tx = db.tx().expect(ERROR_INIT_TX);
         let mut cursor = tx.cursor_read::<CanonicalHeaders>().unwrap();
-        let res = cursor.walk(0).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
+        let res = cursor.walk(None).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
         assert_eq!(res, vec![0, 1, 2, 3, 4, 5]);
         tx.commit().expect(ERROR_COMMIT);
     }
@@ -396,7 +396,7 @@ mod tests {
         // Confirm the result
         let tx = db.tx().expect(ERROR_INIT_TX);
         let mut cursor = tx.cursor_read::<CanonicalHeaders>().unwrap();
-        let res = cursor.walk(0).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
+        let res = cursor.walk(None).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
         assert_eq!(res, vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
         tx.commit().expect(ERROR_COMMIT);
     }
@@ -423,7 +423,7 @@ mod tests {
         // Confirm the result
         let tx = db.tx().expect(ERROR_INIT_TX);
         let mut cursor = tx.cursor_read::<CanonicalHeaders>().unwrap();
-        let res = cursor.walk(0).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
+        let res = cursor.walk(None).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
         assert_eq!(res, vec![0, 1, 2, 3, 4, 5]);
         tx.commit().expect(ERROR_COMMIT);
     }
@@ -451,7 +451,7 @@ mod tests {
         // Confirm the result
         let tx = db.tx().expect(ERROR_INIT_TX);
         let mut cursor = tx.cursor_read::<CanonicalHeaders>().unwrap();
-        let res = cursor.walk(0).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
+        let res = cursor.walk(None).unwrap().map(|res| res.unwrap().0).collect::<Vec<_>>();
         assert_eq!(res, vec![0, 1, 3, 4, 5]);
         tx.commit().expect(ERROR_COMMIT);
     }
@@ -570,7 +570,7 @@ mod tests {
         {
             let tx = env.tx().expect(ERROR_INIT_TX);
             let mut cursor = tx.cursor_dup_read::<PlainStorageState>().unwrap();
-            let mut walker = cursor.walk_dup(key, H256::from_low_u64_be(1)).unwrap();
+            let mut walker = cursor.walk_dup(Some(key), Some(H256::from_low_u64_be(1))).unwrap();
             assert_eq!(
                 (key, value11),
                 walker
@@ -608,8 +608,7 @@ mod tests {
         {
             let tx = env.tx().expect(ERROR_INIT_TX);
             let mut cursor = tx.cursor_dup_read::<PlainStorageState>().unwrap();
-            let first = cursor.first().unwrap().unwrap();
-            let mut walker = cursor.walk_dup(first.0, first.1.key).unwrap();
+            let mut walker = cursor.walk_dup(None, None).unwrap();
 
             // Notice that value11 and value22 have been ordered in the DB.
             assert_eq!(Some(Ok((key1, value00.clone()))), walker.next());
@@ -624,7 +623,7 @@ mod tests {
             let tx = env.tx().expect(ERROR_INIT_TX);
             let mut cursor = tx.cursor_dup_read::<PlainStorageState>().unwrap();
             let first = cursor.first().unwrap().unwrap();
-            let mut walker = cursor.walk(first.0).unwrap();
+            let mut walker = cursor.walk(Some(first.0)).unwrap();
             assert_eq!(Some(Ok((key1, value00))), walker.next());
             assert_eq!(Some(Ok((key1, value11))), walker.next());
             assert_eq!(Some(Ok((key2, value22))), walker.next());
@@ -652,7 +651,7 @@ mod tests {
             let tx = env.tx().expect(ERROR_INIT_TX);
             let mut cursor = tx.cursor_dup_read::<PlainStorageState>().unwrap();
             let first = cursor.first().unwrap().unwrap();
-            let mut walker = cursor.walk(first.0).unwrap();
+            let mut walker = cursor.walk(Some(first.0)).unwrap();
 
             // NOTE: Both values are present
             assert_eq!(Some(Ok((key1, value00.clone()))), walker.next());
@@ -690,7 +689,7 @@ mod tests {
             // It will seek the one greater or equal to the query. Since we have `Address | 100`,
             // `Address | 200` in the database and we're querying `Address | 150` it will return us
             // `Address | 200`.
-            let mut walker = cursor.walk(ShardedKey::new(real_key, 150)).unwrap();
+            let mut walker = cursor.walk(Some(ShardedKey::new(real_key, 150))).unwrap();
             let (key, list) = walker
                 .next()
                 .expect("element should exist.")