# M-12.6 (Multi-Coin)

The multi-coin firmware M-12.6 update includes the following:

* Add a tutorial for OKX Wallet Mobile. 
* Add error prompts for particular transaction scenarios. 
* Change the text color for the inability to parse ABI.
* Support Signing Message with ArConnect.

Tutorial for firmware upgrade:

{% content-ref url="../../getting-started/firmware-upgrading" %}
[firmware-upgrading](https://support.keyst.one/getting-started/firmware-upgrading)
{% endcontent-ref %}