# B-3.4 (BTC-Only)

BTC-Only firmware B-3.4 includes the updates below:

* Resolved the issue with BTC transaction signatures failing in certain situations
* Enhanced Multi-signature wallet compatibility 

Download the latest firmware [here](https://keyst.one/firmware).

Tutorial for firmware upgrade:

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