Hey osamadw11,
First of all, You need to download these :-
Bootloader Unlocking App
Link : https://www.asus.com/Phone/ZenFo ... /HelpDesk_Download/
Twrp Recovery
Link : https://dl.twrp.me/Z00L/
Lineage OS :-
Link : https://download.lineageos.org/Z00L
Gapps Package :-
Link : opengapps.org
(Note :- Download Nano Package, it'll save your Internal Storage)
Now that you have all of the above mentioned items, Follow these Instructions.
1. Unlock Your Bootloader with the Unlocking App.
2. Now, Flash the TWRP Recovery.
(Follow the Instructions on TWRP's website for Flashing!)
3. After Flashing TWRP Recovery Boot into it using these Key Combinations : Power + Volume Down or
Power + Volume up
This Link will help in Installing TWRP : http://www.zenfonehelps.net/how- ... ne-2-laser-ze550kl/
4. Now make a System Backup using the Recovery, and transfer it in your PC for Worst Cases!!
5. Wipe System, Boot, User Data, Cache/Dalvik Cache.
6. Now, connect your device with your PC and transfer Gapps Package and Linegae OS Build onto your device.
(Do not turn off your device, the device should be booted in TWRP Recovery!!)
7. Flash, Lineage OS(First) and then the Gapps Package(Second).
8. Perform a Factory Reset.
9. Wipe Cache/Dalvik Cache.
10. Reboot.
And You're Done.
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