How to root A750F/FN/G/GN Android 9 (Pie)
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- make a KnoxGuard Unlock with ChimeraTool
- flash "Twrp_3.2.3-1_a750_251218.tar" with ChimeraTool. make sure the "Skip Auto Reboot" option is selected!
- restart your phone in recovery mode: press and hold volume_down + power, when the display darkens immediately press and hold volume_up (do not release power)
- twrp: wipe: Format Data (type yes)
- twrp: install: no-verity-opt-encrypt-6.0.zip
- twrp: install: RMM-State_Bypass_Mesa_v2.zip
- twrp: install: Magisk-v18.1.zip
- twrp: wipe: Advanced Wipe: wipe data, cache and dalvik/art cache
- twrp: reboot: system
- install MagiskManager (adb install -r MagiskManager-v7.0.0.apk)
- MagiskManager: Settings/Superuser: Automatic response: grant