How to change Android system boot slot form A to B

How to change Android system boot slot form A to B fastboot change slot --slot SLOT Override the default behavior and prompt fastboot to flash the slot that is passed in as an argument --set-active fastboot set active slot Hi fellow OP6T users, is there a way to change the boot slot for example from _a to _b within the fastboot mode? I read something about a

fastboot set active slot Fastboot firmware, ZIP firmware is official from Xiaomi EU ROM, TWRP and Card slot microSDXC Internal 64GB 4GB RAM, 64GB 6GB RAM

fastboot change slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions  I tried the fastboot update on windows on my thor device and am getting this error: Setting current slot to 'a' OKAY Finished