Hello there,
//Why I reinstalled Android
After several problems with my fairphone (GPS unresponsive, then update to /e/OS 1.20, then almost every app crashing (suspected problem with android webview)), I decided to reinstall OS and get a fresh start for my FP3. I chose to install Android because I had several issues with /e/OS before which I never managed to fix in a 4 years time.
//What I did
So I followed this procedure (https://support.fairphone.com/hc/en-us/articles/18896094650513-Manually-install-Android-OS-on-your-Fairphone), on a Windows 10 computer, and after a couple hours I managed to unlock the bootloader, and install this version ( FP3-6.A.035.2-gms-691ff58c-user-fastbootimage.zip).
//Symptoms
After the end of the script (which was OK, no errors during execution), my FP3 is booting over and over again. It is stuck on the screen with 4 blue dots spinning, for a couple of minutes, then rebooting, displaying warning message about bootloader being unlocked (The boot loader is unlocked and software integrity cannot be guaranteed. Any data…). And looping.
//What I might have done wrong
After reading the procedure again, I realised I did not remove my SIM card during installation, but I doubt this is an issue. Do you have any idea how I could fix this?