Pixel 4a Android 11 Sunfish custom build no valid slot to boot error

fastboot_ error_ failed to identify current slot
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fastboot: error: Command failed The device state in the bootloader fastboot getvar current-slot cange slot to a fastboot --set

If you read the source code, it is way BSP designed to get into download fastboot mode It is designed by BSP, if it could not read the correct

fastboot set active slot  Read-only The current status of the FRU object in the slot fruObjectNum 5 - Error status 6

fastboot change slot If I ignored the error and tried to flash twrp , I'd either get the Failed to identify current slot error listed above or the flash command