fastboot flash both slots
Fastboot commands don't work with Android phone / Newbie Corner ...
Execute the below command in the CMD window to check for the current-active slot: fastboot getvar current-slot. ... If you get current-slot: a, then use the below command: fastboot flash boot_a magisk_patched.img.
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Large Capacity USB Flash Thumb Drive Case: USB memory stick storage organizer can hold 44 USB flash drive, also come with 9 elastic slots for SD SDXC SDHC ...
Unbrick OnePlus 9RT: Flash Firmware via Fastboot Commands
Suppose you wish to flash vbmeta to Slot A, then the command will become: fastboot flash vbmeta_a vbmeta.img.