You mean "Hide Magisk application" - that should be reverted by "Restore Magisk application" before upgrading Magiskgood description… one hint
if you hide magisk by itself, unhide it before update
Of course you can do that also before upgrading the ROM, but it won't matter - unless something goes wrong and you will need to fully reinstall Magisk (incl. the Magisk app)
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Actually it does matter if instead of patching and flashing the boot.img you use the old school:to rename magisk.apk to install.zip and flash through TWRP
But I advised to use the officially recommended method patch and flash (in which case the Magisk app won't be reinstalled when you only upgrade the ROM and there will be no conflict with the previously hidden/renamed Magisk app)
Just one more reason that users finally learn and settle with the 'new' method patching and flashinf (officially recommended by TJW on his Magisk GitHub since the late 2017 or so) instead of going forever with the old way flashing Magisk through TWRP (and then being surprised how to install the Magisk when they bump to A12 with no available TWRP yet)
Sorry all for OT
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