FP3 update 0.12-2020102981459 works well? Please tell

[16NoCo]

@AnotherElk

If you are familiar with the fastboot command …

fastboot getvar current-slot … should give you the slot which now doesn’t boot … or “INVALID” if something went even more wrong.

fastboot --set-active=a or fastboot --set-active=b … will set the slot for the next boot. Try whether the phone boots with this. The data partition is shared between the two slots, so the data will be the same and hopefully not affected so far.

Please read this answer, and if you don’t know how to use fastboot, read what follows on this Topic, and especially:

• put your device in Fastboot mode by holding Power+Volume -, until you see “Fast boot mode” on the screen, and then ↓

@AnotherElk

In this mode …

• Connect your phone to a computer via USB.
• If not done already, download the current Android SDK platform tools to the computer and unzip the ZIP file to a folder you can navigate to easily.
• Open a command line/ terminal and navigate to the folder to which you unzipped the tools. If you are unfamiliar with the command line/ terminal, here’s a really good and short 1 page introduction to everything you need for now … https://tutorial.djangogirls.org/en/intro_to_command_line/
• Execute the commands.
  fastboot devices … will display an ID of your phone if the USB connection and the fastboot command work, it’s a good test before doing anything else.

• And after that, run the fastboot commands above to change the slot.