diff --git a/packages/caver-core-method/src/index.js b/packages/caver-core-method/src/index.js
index dbd70669..22d9838d 100644
--- a/packages/caver-core-method/src/index.js
+++ b/packages/caver-core-method/src/index.js
@@ -38,6 +38,7 @@ const POLLINGTIMEOUT = AVERAGE_BLOCK_TIME * TIMEOUTBLOCK // ~average block time
 
 const TransactionDecoder = require('../../caver-transaction/src/transactionDecoder/transactionDecoder')
 const { TX_TYPE_STRING } = require('../../caver-transaction/src/transactionHelper/transactionHelper')
+const { resolveRawKeyToAccountKey } = require('../../caver-klay/caver-klay-accounts/src/transactionType/account')
 
 function Method(options) {
     // call, name should be existed to create a method.
@@ -427,6 +428,9 @@ const buildSendRequestFunc = (defer, sendSignedTx, sendTxCallback) => (payload,
                 }
             } else if (key === 'codeFormat') {
                 tx[key] = utils.hexToNumber(payload.params[0][key])
+            } else if (key === 'key' && _.isObject(payload.params[0][key])) {
+                // If key field is `AccountForUpdate`, resolve this to raw encoded account key string.
+                tx.key = resolveRawKeyToAccountKey(payload.params[0])
             } else if (key === 'account') {
                 tx.key = payload.params[0][key].getRLPEncodingAccountKey()
             } else if (key === 'chainId') {
diff --git a/packages/caver-klay/caver-klay-accounts/src/transactionType/account.js b/packages/caver-klay/caver-klay-accounts/src/transactionType/account.js
index 210bf4f5..bf098852 100644
--- a/packages/caver-klay/caver-klay-accounts/src/transactionType/account.js
+++ b/packages/caver-klay/caver-klay-accounts/src/transactionType/account.js
@@ -243,4 +243,5 @@ module.exports = {
     rlpEncodeForFeeDelegatedAccountUpdate,
     rlpEncodeForFeeDelegatedAccountUpdateWithRatio,
     parseAccountKey,
+    resolveRawKeyToAccountKey,
 }
diff --git a/packages/caver-transaction/src/transactionHelper/transactionHelper.js b/packages/caver-transaction/src/transactionHelper/transactionHelper.js
index deeaf9c3..0932ac69 100644
--- a/packages/caver-transaction/src/transactionHelper/transactionHelper.js
+++ b/packages/caver-transaction/src/transactionHelper/transactionHelper.js
@@ -175,6 +175,36 @@ const TX_TYPE_TAG = {
     '0x7802': TX_TYPE_STRING.TxTypeEthereumDynamicFee,
 }
 
+const TX_TYPE_TAG_LEGACY_TX_TYPES = {
+    ACCOUNT_UPDATE: TX_TYPE_TAG.TxTypeAccountUpdate,
+    FEE_DELEGATED_ACCOUNT_UPDATE: TX_TYPE_TAG.TxTypeFeeDelegatedAccountUpdate,
+    FEE_DELEGATED_ACCOUNT_UPDATE_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedAccountUpdateWithRatio,
+
+    VALUE_TRANFSER: TX_TYPE_TAG.TxTypeValueTransfer,
+    FEE_DELEGATED_VALUE_TRANSFER: TX_TYPE_TAG.TxTypeFeeDelegatedValueTransfer,
+    FEE_DELEGATED_VALUE_TRANSFER_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedValueTransferWithRatio,
+
+    VALUE_TRANSFER_MEMO: TX_TYPE_TAG.TxTypeValueTransferMemo,
+    FEE_DELEGATED_VALUE_TRANSFER_MEMO: TX_TYPE_TAG.TxTypeFeeDelegatedValueTransferMemo,
+    FEE_DELEGATED_VALUE_TRANSFER_MEMO_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedValueTransferMemoWithRatio,
+
+    SMART_CONTRACT_DEPLOY: TX_TYPE_TAG.TxTypeSmartContractDeploy,
+    FEE_DELEGATED_SMART_CONTRACT_DEPLOY: TX_TYPE_TAG.TxTypeFeeDelegatedSmartContractDeploy,
+    FEE_DELEGATED_SMART_CONTRACT_DEPLOY_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedSmartContractDeployWithRatio,
+
+    SMART_CONTRACT_EXECUTION: TX_TYPE_TAG.TxTypeSmartContractExecution,
+    FEE_DELEGATED_SMART_CONTRACT_EXECUTION: TX_TYPE_TAG.TxTypeFeeDelegatedSmartContractExecution,
+    FEE_DELEGATED_SMART_CONTRACT_EXECUTION_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedSmartContractExecutionWithRatio,
+
+    CANCEL: TX_TYPE_TAG.TxTypeCancel,
+    FEE_DELEGATED_CANCEL: TX_TYPE_TAG.TxTypeFeeDelegatedCancel,
+    FEE_DELEGATED_CANCEL_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedCancelWithRatio,
+
+    CHAIN_DATA_ANCHORING: TX_TYPE_TAG.TxTypeChainDataAnchoring,
+    FEE_DELEGATED_CHAIN_DATA_ANCHORING: TX_TYPE_TAG.TxTypeFeeDelegatedChainDataAnchoring,
+    FEE_DELEGATED_CHAIN_DATA_ANCHORING_WITH_RATIO: TX_TYPE_TAG.TxTypeFeeDelegatedChainDataAnchoringWithRatio,
+}
+
 const CODE_FORMAT = {
     EVM: '0x0',
 }
@@ -186,7 +216,12 @@ const CODE_FORMAT = {
  * @return {number}
  */
 const getTypeInt = type => {
-    return utils.hexToNumber(TX_TYPE_TAG[type])
+    let typeInt = TX_TYPE_TAG[type]
+    // If type int cannot be found from TX_TYPE_TAG, means old type string.
+    if (typeInt === undefined) {
+        typeInt = TX_TYPE_TAG_LEGACY_TX_TYPES[type]
+    }
+    return utils.hexToNumber(typeInt)
 }
 
 /**
diff --git a/test/personal.js b/test/personal.js
index d7aa3cf4..1d988638 100644
--- a/test/personal.js
+++ b/test/personal.js
@@ -136,6 +136,28 @@ describe('Personal RPC test', () => {
         expect(receipt.type).to.equals('TxTypeLegacyTransaction')
     }).timeout(50000)
 
+    // sendTransaction with account update tx
+    it('CAVERJS-UNIT-ETC-404: sendTransaction should format a transaction to send tx with account in Node.', async () => {
+        try {
+            // If account is already existed in node, return error.
+            const address = await caver.klay.personal.importRawKey(senderPrvKey, password)
+            expect(address.toLowerCase()).to.equals(senderAddress.toLowerCase())
+        } catch (e) {}
+
+        const receipt = await caver.klay.personal.sendTransaction(
+            {
+                type: 'ACCOUNT_UPDATE',
+                from: senderAddress,
+                key: caver.klay.accounts.createAccountForUpdateWithLegacyKey(senderAddress),
+                gas: 900000,
+            },
+            password
+        )
+        console.log(receipt)
+        expect(receipt).not.to.be.null
+        expect(receipt.type).to.equals('TxTypeAccountUpdate')
+    }).timeout(50000)
+
     // signTransaction
     it('CAVERJS-UNIT-ETC-088: signTransaction should send a signed transaction using an account in the node.', async () => {
         const testAccount = caver.klay.accounts.create()