How to Fix Fastboot OEM Unlock Waiting for any device

Android fastboot 查詢當前使用的ab槽 fastboot set active slot stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device > fastboot change slot --slot SLOT Use SLOT; 'all' for both slots, 'other' for non-current slot --set-active Sets the active slot before

fastboot_ error_ failed to identify current 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