Through this guide I followed this, needed to set the active slots through the process like he did but when trying to start the system it goes into a short bootloop and then into recovery mode. I tried to set the active slot back to a (first I started with active b slot) but this wouldnt change the outcome. Do I need to set the slot to something different to get the OS started? Maybe Im missing a little command at the end? Through the installation process the only error occured when flashing the boot.img: I solved it by adapating the command from
fastboot flash boot boot.img
to
fastboot flash:raw boot boot.img
but only with this step I added the raw.
Can you help me, please?
Edit: FP3 installation : stuck in fastboot mode: this doesnt helped.
Edit2: also this, step 3, didnt helped. Getting lost, I dont understand what went wrong 