This happens if there is a mismatch between the firmware configuration and the physical partitions on the device. Ensure that you are using the specific 1H10 revision and not a generic 7731 ROM.
A: Yes. You can flash Magisk via the SPD Flash Tool by patching the boot.img from the verified PAC file. But stay with native firmware for stability first. sp7731e 1h10 native firmware verified
Some pre-installed system apps can be malicious. Flashing verified stock firmware wipes everything and restores the original system partition. This happens if there is a mismatch between