> For the complete documentation index, see [llms.txt](https://support.keyst.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.keyst.one/changelog/keystone-firmware-btc-only/b-3.4-btc-only.md).

# 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="/pages/-MVz-o9g8Dc-vlyVuAZj" %}
[Firmware Upgrade](/getting-started/firmware-upgrading.md)
{% endcontent-ref %}