: Download the latest official app from the Magisk GitHub Repository.

Reboot your TV back into Fastboot mode: adb reboot bootloader

Wait for the TV to boot up normally. You will need to complete the initial Android TV setup wizard again. Re-enable after setup finishes. Section 4: Patching the Boot Image via Magisk

Magisk will process the file and output a modified file named magisk_patched.img in your TV's Downloads folder.