It was my own failure, but maybe you can help me:
I tried to root my fairphone.
I disabled Googles applications
Then the Fairphone didn’t want start anymore.
I tried to restore the Fairphone with the original image: [HOW TO] Flash a custom ROM on FP3 with GSI
But I couldn’t boot the TWRP image.
I couldn’t boot any image. So I tried to activate via fastboot --set-active=a and b
But now, the Fairphone don’t want to start at all. The phone vibrates, shows the Fairphone-splashscreen very short and shutdown. If I plug the power cable, no LED glowing too.
Has anybody any suggestions?
Way for solving the problem
Pressing Volume-down & power-button to start fastboot
try to fastboot --set-active=a or b
in my case, if the b-slot is active, the device run fastboot (but the reason for this could also be flashing of the device (see #3 in FP 3 won't start anymore). in slot a the phone shows only short bootsplash and shutdown.
Anyway I can’t boot twrp, but that’s another problem…