Guide: Check and Change the Slot Manually (A/B)

🧭 Guide: Check and Change the Slot Manually (A/B)

Some Android devices use A/B partitions, meaning two "slots" (A and B) where the system can be installed. Swapping the wrong slot can cause a boot loop or flash failure, so always check beforehand.

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🔍 1. Check Current Slot

Before installing anything, check which slot is active:

current-slot: a

or

current-slot: b

🔄 2. Manually Change Slot

If you want to change the active slot, use:

fastboot set_active a

or

fastboot set_active b

⚠️ Note: This only changes the boot slot — it does not copy data or install the system in the other slot.

Make sure the chosen slot has a working ROM before rebooting.

💡 Extra Tip

Some recoveries (like TWRP or Lineage Recovery) show the active slot on the home screen.

If the device does not boot after flashing, try switching the slot again and rebooting:

fastboot set_active a

fastboot reboot