I have bought a Home Assistant yellow which has been serving me well for a while.
Recently I started getting errors from Zigbee2mqtt (Z2M).
Some research suggested that I needed to use the new ember driver in Z2M, but instructions where very unclear.
The Home Assistant Yellow contains a radio from Silabs and there is an addon called silabs flasher that can be used to put the newest firmware on your home assistant yellow.
Make sure to turn off Z2M addon and note down the device path e.g.
/dev/ttyAMA1
Put this into the silabs flasher addon and start.
At the time of writing this is the latest relevant firmware:
https://github.com/darkxst/silabs-firmware-builder/blob/main/firmware_builds/yellow/ncp-uart-hw-v7.4.3.0-yellow-115200.gbl