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This time I am making a backup in TWRP, The default backup options in TWRP are system, data, and boot. For most cases, this is sufficient for backing up a ROM. I am doing this as a precaution before proceeding.Now downloading the latest Magisk Uninstaller from here: https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445Now reboot the phone to android desktop, and enable file sharing to copy the uninstaller to the phone, then reboot to recovery mode and install the uninstaller to clean things up before we try again.