I have a fairphone 3 I bought from the e.foundation shop.
I recently installed e.foundation q (Android 10) (Version of October 29).
Today I installed the December 7 upgrade.
Everything looked fine until the reboot.
The device did not start again.
Even worse, the phone does not show any signs of operation since:
Recently I had to disassemble my FP3 completely because the touchscreen was not responding at all, even after rebooting or removing the battery. As you just updated your phone, it may be a software issue, but maybe there is a hardware issue and the electrical contacts no longer work properly.
This is just a suggestion
I know about the contact issues in FP’s modular design, had to disassembly my previous phone (FP2) from time to time, myself.
In this case, on the other hand, it’s not just a flickering screen or interrupted connections. The phone is entirely dead.
If it were a hardware issue, it would be a very strange coincidence that it hit precisely after the update rebooted the system - while the phone lay flat on the table without any outer disturbances.
I had an issue where my FP3 went (hard?) bricked, after trying to repair myself a corrupted update (by the way: bad idea to adb push partitions without knowing exactly what you are doing).
See this thread, where I explained my issue and asked how to reset: @AnotherElk linked me a thread on the Fairphone forum, and I gave a feedback about the steps I had to perform.