---
title: "Migration from 1.1.0 to 1.2.0"
category: how-to
---

# Migration from 1.1.0 to 1.2.0

We made some breaking changes to the Ethereum Signer in 1.2.0 which are detailed below.

## signTransaction

The transaction type has been changed to `Uint8Array` instead of `Transaction` from ethers `v5` or `v6`.

To sign a transaction, you need to serialize it to a `Uint8Array` before calling `signTransaction`.

### From a `string`

You can use the `hexaStringToBuffer` utility from the DeviceManagementKit to convert a hexa string to a `Uint8Array`.

```typescript
const rawTx = hexaStringToBuffer(tx);
if (!rawTx) {
  throw new Error("Invalid transaction format");
}

signer.signTransaction(derivationPath, rawTx, { domain });
```

### From a `Transaction` object from ethers `v6`

You can use the `unsignedSerialized` property from the `Transaction` object
combined with the `hexaStringToBuffer` utility from the DeviceManagementKit to convert a hexa string to a `Uint8Array`.

```typescript
const rawTx = hexaStringToBuffer(tx.unsignedSerialized);
if (!rawTx) {
  throw new Error("Invalid transaction format");
}

signer.signTransaction(derivationPath, rawTx, { domain });
```