3djc
@Gjeremie , could you try #5902 ?
Are you doing a DFU flash or just a firmware flash ? Tested https://github.com/EdgeTX/edgetx/pull/5902 and I don't loose time here with MT12
You should try with DFU (connect USB while radio is off). You can use Companion to do it using Read/Write then Write firmware to radio
Could you try with a new battery ? (Yes I know it works with older versions)
Removing RTC Backup is not world best idea, albeit it might be less critical on a surface radio I guess
When things go bad (could be software issue, interference, hardware glitch), a hardware watchdogs resets the radio and signals something bad happened. When restarting, EdgeTX detect the "something went bad"...
Still, between the risk of loosing time, and the risk of loosing models, I would choose to fix the later, and to some extent is a tribute to show how...
We will need you model file for that, but usually that can happen if you did not set catchall mix line
@philmoz the model file is here https://github.com/EdgeTX/edgetx/issues/5088#issuecomment-2145755290 (haven't had the time to look at it yet)