> For the complete documentation index, see [llms.txt](https://docs.auterion.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.auterion.com/release-notes/flight-control/apx4-2.5/apx4-2.5.8.md).

# APX4 2.5.8

## Compatibility

Please use Auterion Mission Control 1.14.6 or newer with this version of APX4:

{% content-ref url="/pages/6gent0PLKRkVHkHCsHDB" %}
[AMC 1.14.6](/release-notes/auterion-mission-control-release-notes/amc-1.14/amc-1.14.6.md)
{% endcontent-ref %}

## New Features <a href="#new-features-1" id="new-features-1"></a>

* Preflight check for hardfaults on SD card

## What improved <a href="#what-improved.1" id="what-improved.1"></a>

* Improved emergency yaw estimation when magnetometer data is degraded
* Preflight check to ensure system has specified number of calibrated and enabled magnetometers

## Bug fixes <a href="#bug-fixes.1-1" id="bug-fixes.1-1"></a>

* UAVCAN battery reporting synced with PX4 battery library

##

##