FP4 - Stuck in fastboot mode - relock the bootloader

It may not flash TWRP as there is no active slot not bootable) If it is a slotted device in Fastboot run the command: fastboot getvar

Android phones can now have an A and a B partition system for the OS and we can use this fastboot command to check and see which slot is currently active

fastboot getvar currentslot It means fastboot is waiting for a phone to be connected If the phone is physically connected but fastboot cannot find it, then either the

fastboot get active slot being installed to the opposite partition than you're currently on So active and you can