> For the complete documentation index, see [llms.txt](https://flyduino.gitbook.io/kiss-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flyduino.gitbook.io/kiss-documentation/english-kiss-docu/kiss-esc-25a/fw-revisions.md).

# FW revisions

KISS ESC 25A FW revisions

{% hint style="info" %}
FW is available on <https://github.com/flyduino/kissesc-firmware/releases/>
{% endhint %}

{% hint style="info" %}
There are two versions available of this FW\
voice - plays voice sounds at the start up.\
beep - plays beep sounds at the start up.
{% endhint %}

{% hint style="success" %}
**Please use always the latest stable release** unless u have a serious reasons to use one of the beta/unstable versions. Releases are sorted by date descending.
{% endhint %}

## 20180627 - v121a voice

stable release - voice version

### changes

* fix a problem where low voltage (below 5v) caused config to reset
* add support for new KISS 25A (Single + 4-in-1 ESC)

### file

&#x20;[**KISS25A\_121a\_SVOICE.hex**](https://github.com/flyduino/kissesc-firmware/releases/download/121a_voice/KISS25A_121a_SVOICE.hex)

## 20180627 - v121a beep

stable release - beep version

### changes

* fix a problem where low voltage (below 5v) caused config to reset
* add support for new KISS 25A (Single + 4-in-1 ESC)

### file

&#x20;[**KISS25A\_121a\_SBEEP.hex**](https://github.com/flyduino/kissesc-firmware/releases/download/121a_beep/KISS25A_121a_SBEEP.hex)