Transfer the patched file back to your PC. Use Odin3 to flash the file. Place the patched AP file in the AP slot.
Open the Magisk App and select -> Select and Patch a File . galaxay A03 patch boot A035FXXU1AVF5 (ombob.my…
Transfer the extracted boot.img (or the whole AP file) to the phone's internal storage. Transfer the patched file back to your PC