Boot Image Extra Was Patched By Old Unsupported Magisk

If you previously used a very old Magisk version (say, v16 or v17) and never fully uninstalled it before upgrading, your boot image retains legacy signatures and patches in the "extra" area. The new Magisk refuses to overwrite these because doing so could lead to boot loops or corruption of device-specific OEM data stored in that section.

fastboot flash boot magisk_patched.img

fastboot boot twrp.img # or any custom recovery # In recovery, check /proc/self/mounts for "magisk" adb shell "magisk -c" # Should fail if clean Boot Image Extra Was Patched By Old Unsupported Magisk

The "Boot Image Extra" refers to additional data or modifications made to the boot image of a device. The boot image is crucial as it contains the initial code that runs when a device starts up, responsible for initializing the hardware and launching the operating system. If you previously used a very old Magisk