How to change Android system boot slot form A to B

fastboot • help - fastboot set active slot --slot SLOT Override the default behavior and prompt fastboot to flash the slot that is passed in as an argument · --set-active Set fastboot getvar currentslot getvar variable> Display a bootloader variable set_active suffix> Sets the active slot If slots are not supported, this does nothing boot kernel> [

fastboot change slot Substitute the name of the bootloader image determined in the first step above, if different, for the image file name argument fastboot --slot=other flash