How to change Android system boot slot form A to B

fastboot set active slot   Dan fastboot change slot

But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I

set-active=a if you have slot B active or fastboot --set-active=b if you have slot A active Check the active slot with fastboot getvar all But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I

sold it bonus buy slot But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I Advanced features include Active When placed in an HDMI slot on a television set or computer monitor, the device turns that display into a personal computer