FP 5 - Upgrade/Install went wrong (now: stuck in bootloader) - iode

Hello @Tooli,Welcome to the Fairphone users forum.

hopefully, the bootloader looks still unlocked
please confirm by running

fastboot oem device-info

also you could try booting on the other slot

fastboot set_active other

even thinked for another alternative android OS, you can take inspiration reading
A clear guide to install /e/OS on your Fairphone