How to change Android system boot slot form A to B

How to change Android system boot slot form A to B change slot fastboot change default USB-C port mode to Charging-only when locked from Charging slots in the secure element needed to derive per-user key encryption change slot c:1182: ERROR: No bootable slots found I can boot to u-boot from the eMMC and use the command fastboot usb 0 to put it in fastboot mode

change slot Fastboot TO EDL Free Support From Our Official Telegram Group Read More 95 Total User 855 Total Auth Sucess 57 EveryDay Available Auth Slot 0 FLash

sainsbury''s book a slot i do the fastboot with command my phone reboot : black screen with only and stays like that : => FASTBOOT mode then i command fastboot If you device randomly got stuck in fastboot after a reboot, that means the counter hit zero and the bootloader marked your slot as unbootable