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Magisk is helpful to allow you to modify everything without modifying the /system partition.
If you can find the boot.img, allow Magisk to modify it and not flash have it, you have the safest way. You will need to fastboot boot the image everytime you come up from a power off. But the advantage is, if you let it boot normally (without fastboot) you will have 100% stock system.
An entirely separate way to do things would be to make a full backup of the system partition. Then you could do what you want with it (if dm verity were off?). When it came time to do another update you restore the partition backup and then do the update, then redo your mods.
Please clear up something for me:
Does the Nova Air itself have buttons corresponding to the case?
Does the case work on contacts to the Nova? I was presuming that it was Bluetooth. How many contacts? Photos?
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