No slot selected but can get to bootloader screen and

Guide: fix-fastboot-error Current Active Slot 04:47 Flash Fastboot ROM

As @aibd linked to, in fastboot mode you can run fastboot getvar current-slot to find out But if you specify the partition with _a or _b at

fastboot change slot fastboot: error: Command failed Issue summary Comments All comments Oldest first Instructing fastbootd to flash both slots seemed to work

fastboot get active slot In boota get fastboot lock status error c:1341: ERROR: Error verifying slot _a with result ERROR_INVALID_METADATA