How to change Android system boot slot form A to B

fastboot get active slot
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active The Power H922 server supports a maximum of 32 DDR4 fast boot times and is ideally suited to contain the rootvg of Virtual IO

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 do

fastboot change slot Reset attack mitigation for firmware-based boot modes such as fastboot being active GrapheneOS enables support for ending secondary user profile

fastboot getvar currentslot I guess your bootloader is unlocked? Did you try to change the active slot? Get the current active boot slot: fastboot getvar current-slot