Android fastboot 查詢當前使用的ab槽

getvar is-userspace Gets a bootloader variable that is required for flashing of recoveryboot image

Boot your smartphone into Fastboot Mode · Now, connect your smartphone to the PC using a USB cable · Open a Command Prompt, Terminal, or

fastboot_ error_ failed to identify current slot slots ourselves using a Fastboot command Checking Android's Currently Active

fastboot get active slot output from fastboot getvar all : security-patch-level: current-slot:b