diff --git a/.gitignore b/.gitignore
index 21c173828..21516dc8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,5 @@ l1-contracts/script-config/*
 l1-contracts/script-out/*
 !l1-contracts/script-out/.gitkeep
 *.timestamp
+l1-contracts/test/foundry/l1/integration/deploy-scripts/script-out/*
+l1-contracts/zkout/*
diff --git a/l1-contracts/deploy-scripts/DeployL2Contracts.sol b/l1-contracts/deploy-scripts/DeployL2Contracts.sol
index 1a02fd391..fb3f35024 100644
--- a/l1-contracts/deploy-scripts/DeployL2Contracts.sol
+++ b/l1-contracts/deploy-scripts/DeployL2Contracts.sol
@@ -46,12 +46,20 @@ contract DeployL2Script is Script {
     }
 
     function run() public {
+        deploy(false);
+    }
+
+    function runWithLegacyBridge() public {
+        deploy(true);
+    }
+
+    function deploy(bool legacyBridge) public {
         initializeConfig();
-        loadContracts();
+        loadContracts(legacyBridge);
 
         deployFactoryDeps();
         deploySharedBridge();
-        deploySharedBridgeProxy();
+        deploySharedBridgeProxy(legacyBridge);
         initializeChain();
         deployForceDeployer();
         deployConsensusRegistry();
@@ -60,13 +68,21 @@ contract DeployL2Script is Script {
         saveOutput();
     }
 
+    function runDeployLegacySharedBridge() public {
+        deploySharedBridge(true);
+    }
+
     function runDeploySharedBridge() public {
+        deploySharedBridge(false);
+    }
+
+    function deploySharedBridge(bool legacyBridge) internal {
         initializeConfig();
-        loadContracts();
+        loadContracts(legacyBridge);
 
         deployFactoryDeps();
         deploySharedBridge();
-        deploySharedBridgeProxy();
+        deploySharedBridgeProxy(legacyBridge);
         initializeChain();
 
         saveOutput();
@@ -74,7 +90,7 @@ contract DeployL2Script is Script {
 
     function runDefaultUpgrader() public {
         initializeConfig();
-        loadContracts();
+        loadContracts(false);
 
         deployForceDeployer();
 
@@ -83,7 +99,7 @@ contract DeployL2Script is Script {
 
     function runDeployConsensusRegistry() public {
         initializeConfig();
-        loadContracts();
+        loadContracts(false);
 
         deployConsensusRegistry();
         deployConsensusRegistryProxy();
@@ -91,7 +107,7 @@ contract DeployL2Script is Script {
         saveOutput();
     }
 
-    function loadContracts() internal {
+    function loadContracts(bool legacyBridge) internal {
         //HACK: Meanwhile we are not integrated foundry zksync we use contracts that has been built using hardhat
         contracts.l2StandardErc20FactoryBytecode = Utils.readHardhatBytecode(
             "/../l2-contracts/artifacts-zk/@openzeppelin/contracts-v4/proxy/beacon/UpgradeableBeacon.sol/UpgradeableBeacon.json"
@@ -103,9 +119,16 @@ contract DeployL2Script is Script {
             "/../l2-contracts/artifacts-zk/contracts/bridge/L2StandardERC20.sol/L2StandardERC20.json"
         );
 
-        contracts.l2SharedBridgeBytecode = Utils.readFoundryBytecode(
-            "/../l2-contracts/zkout/L2SharedBridge.sol/L2SharedBridge.json"
-        );
+        if (legacyBridge) {
+            contracts.l2SharedBridgeBytecode = Utils.readHardhatBytecode(
+                "/../l2-contracts/artifacts-zk/contracts/dev-contracts/DevL2SharedBridge.sol/DevL2SharedBridge.json"
+            );
+        } else {
+            contracts.l2SharedBridgeBytecode = Utils.readHardhatBytecode(
+                "/../l2-contracts/zkout/L2SharedBridge.sol/L2SharedBridge.json"
+            );
+        }
+
         contracts.l2SharedBridgeProxyBytecode = Utils.readHardhatBytecode(
             "/../l2-contracts/artifacts-zk/@openzeppelin/contracts-v4/proxy/transparent/TransparentUpgradeableProxy.sol/TransparentUpgradeableProxy.json"
         );
@@ -186,13 +209,20 @@ contract DeployL2Script is Script {
         });
     }
 
-    function deploySharedBridgeProxy() internal {
+    function deploySharedBridgeProxy(bool legacyBridge) internal {
         address l2GovernorAddress = AddressAliasHelper.applyL1ToL2Alias(config.governance);
         bytes32 l2StandardErc20BytecodeHash = L2ContractHelper.hashL2Bytecode(contracts.beaconProxy);
 
+        string memory functionSignature;
+
+        if (legacyBridge) {
+            functionSignature = "initializeDevBridge(address,address,bytes32,address)";
+        } else {
+            functionSignature = "initialize(address,address,bytes32,address)";
+        }
         // solhint-disable-next-line func-named-parameters
         bytes memory proxyInitializationParams = abi.encodeWithSignature(
-            "initialize(address,address,bytes32,address)",
+            functionSignature,
             config.l1SharedBridgeProxy,
             config.erc20BridgeProxy,
             l2StandardErc20BytecodeHash,
diff --git a/l1-contracts/deploy-scripts/dev/SetupLegacyBridge.s.sol b/l1-contracts/deploy-scripts/dev/SetupLegacyBridge.s.sol
new file mode 100644
index 000000000..301bfd2c8
--- /dev/null
+++ b/l1-contracts/deploy-scripts/dev/SetupLegacyBridge.s.sol
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import {Script} from "forge-std/Script.sol";
+import {stdToml} from "forge-std/StdToml.sol";
+import {Utils} from "./../Utils.sol";
+import {L1SharedBridge} from "contracts/bridge/L1SharedBridge.sol";
+import {DummyL1ERC20Bridge} from "contracts/dev-contracts/DummyL1ERC20Bridge.sol";
+import {ProxyAdmin} from "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
+import {ITransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
+import {L2ContractHelper} from "contracts/common/libraries/L2ContractHelper.sol";
+
+/// This scripts is only for developer
+contract SetupLegacyBridge is Script {
+    using stdToml for string;
+
+    Config internal config;
+    Addresses internal addresses;
+
+    struct Config {
+        uint256 chainId;
+        address l2SharedBridgeAddress;
+        bytes32 create2FactorySalt;
+    }
+
+    struct Addresses {
+        address create2FactoryAddr;
+        address bridgehub;
+        address diamondProxy;
+        address sharedBridgeProxy;
+        address transparentProxyAdmin;
+        address erc20BridgeProxy;
+        address tokenWethAddress;
+        address erc20BridgeProxyImpl;
+        address sharedBridgeProxyImpl;
+    }
+
+    function run() public {
+        initializeConfig();
+        deploySharedBridgeImplementation();
+        upgradeImplementation(addresses.sharedBridgeProxy, addresses.sharedBridgeProxyImpl);
+        deployDummyErc20Bridge();
+        upgradeImplementation(addresses.erc20BridgeProxy, addresses.erc20BridgeProxyImpl);
+        setParamsForDummyBridge();
+    }
+
+    function initializeConfig() internal {
+        string memory root = vm.projectRoot();
+        string memory path = string.concat(root, "/script-config/setup-legacy-bridge.toml");
+        string memory toml = vm.readFile(path);
+
+        addresses.bridgehub = toml.readAddress("$.bridgehub");
+        addresses.diamondProxy = toml.readAddress("$.diamond_proxy");
+        addresses.sharedBridgeProxy = toml.readAddress("$.shared_bridge_proxy");
+        addresses.transparentProxyAdmin = toml.readAddress("$.transparent_proxy_admin");
+        addresses.erc20BridgeProxy = toml.readAddress("$.erc20bridge_proxy");
+        addresses.tokenWethAddress = toml.readAddress("$.token_weth_address");
+        addresses.create2FactoryAddr = toml.readAddress("$.create2factory_addr");
+        config.chainId = toml.readUint("$.chain_id");
+        config.l2SharedBridgeAddress = toml.readAddress("$.l2shared_bridge_address");
+        config.create2FactorySalt = toml.readBytes32("$.create2factory_salt");
+    }
+
+    // We need to deploy new shared bridge for changing chain id and diamond proxy address
+    function deploySharedBridgeImplementation() internal {
+        bytes memory bytecode = abi.encodePacked(
+            type(L1SharedBridge).creationCode,
+            // solhint-disable-next-line func-named-parameters
+            abi.encode(addresses.tokenWethAddress, addresses.bridgehub, config.chainId, addresses.diamondProxy)
+        );
+
+        address contractAddress = deployViaCreate2(bytecode);
+        addresses.sharedBridgeProxyImpl = contractAddress;
+    }
+
+    function deployDummyErc20Bridge() internal {
+        bytes memory bytecode = abi.encodePacked(
+            type(DummyL1ERC20Bridge).creationCode,
+            // solhint-disable-next-line func-named-parameters
+            abi.encode(addresses.sharedBridgeProxy)
+        );
+        address contractAddress = deployViaCreate2(bytecode);
+        addresses.erc20BridgeProxyImpl = contractAddress;
+    }
+
+    function upgradeImplementation(address proxy, address implementation) internal {
+        bytes memory proxyAdminUpgradeData = abi.encodeCall(
+            ProxyAdmin.upgrade,
+            (ITransparentUpgradeableProxy(proxy), implementation)
+        );
+        ProxyAdmin _proxyAdmin = ProxyAdmin(addresses.transparentProxyAdmin);
+        address governance = _proxyAdmin.owner();
+
+        Utils.executeUpgrade({
+            _governor: address(governance),
+            _salt: bytes32(0),
+            _target: address(addresses.transparentProxyAdmin),
+            _data: proxyAdminUpgradeData,
+            _value: 0,
+            _delay: 0
+        });
+    }
+
+    function setParamsForDummyBridge() internal {
+        (address l2TokenBeacon, bytes32 l2TokenBeaconHash) = calculateTokenBeaconAddress();
+        DummyL1ERC20Bridge bridge = DummyL1ERC20Bridge(addresses.erc20BridgeProxy);
+        bridge.setValues(config.l2SharedBridgeAddress, l2TokenBeacon, l2TokenBeaconHash);
+    }
+
+    function calculateTokenBeaconAddress()
+        internal
+        returns (address tokenBeaconAddress, bytes32 tokenBeaconBytecodeHash)
+    {
+        bytes memory l2StandardTokenCode = Utils.readHardhatBytecode(
+            "/../l2-contracts/artifacts-zk/contracts/bridge/L2StandardERC20.sol/L2StandardERC20.json"
+        );
+        (address l2StandardToken, ) = calculateL2Create2Address(
+            config.l2SharedBridgeAddress,
+            l2StandardTokenCode,
+            bytes32(0),
+            ""
+        );
+
+        bytes memory beaconProxy = Utils.readHardhatBytecode(
+            "/../l2-contracts/artifacts-zk/@openzeppelin/contracts/proxy/beacon/BeaconProxy.sol/BeaconProxy.json"
+        );
+
+        (tokenBeaconAddress, tokenBeaconBytecodeHash) = calculateL2Create2Address(
+            config.l2SharedBridgeAddress,
+            beaconProxy,
+            bytes32(0),
+            abi.encode(l2StandardToken)
+        );
+    }
+
+    function calculateL2Create2Address(
+        address sender,
+        bytes memory bytecode,
+        bytes32 create2salt,
+        bytes memory constructorargs
+    ) internal returns (address create2Address, bytes32 bytecodeHash) {
+        bytecodeHash = L2ContractHelper.hashL2Bytecode(bytecode);
+
+        create2Address = L2ContractHelper.computeCreate2Address(
+            sender,
+            create2salt,
+            bytecodeHash,
+            keccak256(constructorargs)
+        );
+    }
+
+    function deployViaCreate2(bytes memory _bytecode) internal returns (address) {
+        return Utils.deployViaCreate2(_bytecode, config.create2FactorySalt, addresses.create2FactoryAddr);
+    }
+}
diff --git a/l1-contracts/test/unit_tests/custom_base_token.spec.ts b/l1-contracts/test/unit_tests/custom_base_token.spec.ts
index 464298482..b7dce29b1 100644
--- a/l1-contracts/test/unit_tests/custom_base_token.spec.ts
+++ b/l1-contracts/test/unit_tests/custom_base_token.spec.ts
@@ -147,7 +147,8 @@ describe("Custom base token chain and bridge tests", () => {
     const revertReason = await getCallRevertReason(
       l1SharedBridge.connect(randomSigner).finalizeWithdrawal(chainId, 0, 0, 0, "0x", [])
     );
-    expect(revertReason).contains("MalformedMessage");
+    console.log(revertReason);
+    expect(revertReason).contains("L2WithdrawalMessageWrongLength");
   });
 
   it("Should revert on finalizing a withdrawal with wrong function selector", async () => {
diff --git a/l1-contracts/test/unit_tests/l1_shared_bridge_test.spec.ts b/l1-contracts/test/unit_tests/l1_shared_bridge_test.spec.ts
index 31475e241..fb5cf437d 100644
--- a/l1-contracts/test/unit_tests/l1_shared_bridge_test.spec.ts
+++ b/l1-contracts/test/unit_tests/l1_shared_bridge_test.spec.ts
@@ -129,7 +129,7 @@ describe("Shared Bridge tests", () => {
     const revertReason = await getCallRevertReason(
       l1SharedBridge.connect(randomSigner).finalizeWithdrawal(chainId, 0, 0, 0, "0x", [ethers.constants.HashZero])
     );
-    expect(revertReason).contains("MalformedMessage");
+    expect(revertReason).contains("L2WithdrawalMessageWrongLength");
   });
 
   it("Should revert on finalizing a withdrawal with wrong message length", async () => {
@@ -145,7 +145,7 @@ describe("Shared Bridge tests", () => {
           [ethers.constants.HashZero]
         )
     );
-    expect(revertReason).contains("MalformedMessage");
+    expect(revertReason).contains("L2WithdrawalMessageWrongLength");
   });
 
   it("Should revert on finalizing a withdrawal with wrong function selector", async () => {
@@ -183,7 +183,7 @@ describe("Shared Bridge tests", () => {
     const revertReason = await getCallRevertReason(
       l1SharedBridge.connect(randomSigner).finalizeWithdrawal(chainId, 0, 0, 0, "0x", [ethers.constants.HashZero])
     );
-    expect(revertReason).contains("MalformedMessage");
+    expect(revertReason).contains("L2WithdrawalMessageWrongLength");
   });
 
   it("Should revert on finalizing a withdrawal with wrong function signature", async () => {
diff --git a/l1-contracts/test/unit_tests/l2-upgrade.test.spec.ts b/l1-contracts/test/unit_tests/l2-upgrade.test.spec.ts
index b5d97bf7d..1f6af8899 100644
--- a/l1-contracts/test/unit_tests/l2-upgrade.test.spec.ts
+++ b/l1-contracts/test/unit_tests/l2-upgrade.test.spec.ts
@@ -42,7 +42,7 @@ import {
 } from "./utils";
 import { packSemver, unpackStringSemVer, addToProtocolVersion } from "../../scripts/utils";
 
-describe.only("L2 upgrade test", function () {
+describe("L2 upgrade test", function () {
   let proxyExecutor: ExecutorFacet;
   let proxyAdmin: AdminFacet;
   let proxyGetters: GettersFacet;
diff --git a/l1-contracts/test/unit_tests/legacy_era_test.spec.ts b/l1-contracts/test/unit_tests/legacy_era_test.spec.ts
index 0f4f26bd9..44469df8c 100644
--- a/l1-contracts/test/unit_tests/legacy_era_test.spec.ts
+++ b/l1-contracts/test/unit_tests/legacy_era_test.spec.ts
@@ -164,7 +164,7 @@ describe("Legacy Era tests", function () {
     const revertReason = await getCallRevertReason(
       l1ERC20Bridge.connect(randomSigner).finalizeWithdrawal(0, 0, 0, "0x", [ethers.constants.HashZero])
     );
-    expect(revertReason).contains("MalformedMessage");
+    expect(revertReason).contains("L2WithdrawalMessageWrongLength");
   });
 
   it("Should revert on finalizing a withdrawal with wrong function signature", async () => {
diff --git a/l1-contracts/test/unit_tests/mailbox_test.spec.ts b/l1-contracts/test/unit_tests/mailbox_test.spec.ts
index 5bb874381..230f4e46e 100644
--- a/l1-contracts/test/unit_tests/mailbox_test.spec.ts
+++ b/l1-contracts/test/unit_tests/mailbox_test.spec.ts
@@ -105,7 +105,7 @@ describe("Mailbox tests", function () {
       )
     );
 
-    expect(revertReason).contains("MalformedBytecode");
+    expect(revertReason).contains("LengthIsNotDivisibleBy32");
   });
 
   it("Should not accept bytecode of even length in words", async () => {
diff --git a/l1-contracts/test/unit_tests/proxy_test.spec.ts b/l1-contracts/test/unit_tests/proxy_test.spec.ts
index e63abe0bb..5336f3266 100644
--- a/l1-contracts/test/unit_tests/proxy_test.spec.ts
+++ b/l1-contracts/test/unit_tests/proxy_test.spec.ts
@@ -134,14 +134,14 @@ describe("Diamond proxy tests", function () {
     const proxyAsERC20 = TestnetERC20TokenFactory.connect(proxy.address, proxy.signer);
 
     const revertReason = await getCallRevertReason(proxyAsERC20.transfer(proxyAsERC20.address, 0));
-    expect(revertReason).contains("InvalidSelector");
+    expect(revertReason).contains("F");
   });
 
   it("check that proxy reject data with no selector", async () => {
     const dataWithoutSelector = "0x1122";
 
     const revertReason = await getCallRevertReason(proxy.fallback({ data: dataWithoutSelector }));
-    expect(revertReason).contains("MalformedCalldata");
+    expect(revertReason).contains("Ut");
   });
 
   it("should freeze the diamond storage", async () => {
@@ -178,7 +178,7 @@ describe("Diamond proxy tests", function () {
         data: executorFacetSelector3 + "0000000000000000000000000000000000000000000000000000000000000000",
       })
     );
-    expect(revertReason).contains("FacetIsFrozen");
+    expect(revertReason).contains("q1");
   });
 
   it("should be able to call an unfreezable facet when diamondStorage is frozen", async () => {