FP4 - Stuck in fastboot mode - relock the bootloader

I guess your bootloader is unlocked? Did you try to change the active slot? Get the current active boot slot: fastboot getvar current-slot

fast boot Raspberry Pi OS The latest release of Raspberry Pi OS is made to get the most from Raspberry Pi 5 The newest version of our operating system

fastboot get active slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions

fastboot_ error_ failed to identify current slot stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device >