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Unlocking the bootloader gives you an option to perform multiple modifications to your Android device but, rooting your phone void the warranty and also you won't be able to receive any OTA updates further.
To unroot and lock your phone's bootloader you can follow the steps carefully mentioned below:
You can see that on device stats or fastboot splash screen
Now Download the Stock Oreo ROM here and flash it to your device using Asus Flash Tool
While flashing RAW firmware via Asus Flash Tool if you get any error ( FRP request error) just ignore it.
After booting, if it asks for pin then just wipe data and cache via Recovery Mode
To enter recovery mode just press Power Button + Volume Down)
Also, check the attached video for your reference for Asus Zenfone 3.
MArun Kumar Arul
Asus Zenfone 3 vs Samsung Galaxy A7 2017
Both the phones have their pros and cons, lets analyze:-
Advantages of Asus ZenFone 3 :-
1.More RAM:-More RAM means more applications can run at the same time,
2.More Storage Capacity:-. More memory allows you to store more songs, videos, photos and install more applications.
Advantages of Samsung Galaxy A7 (2017)
1.Bigger Battery:-It can generally last more time.
2.Supports NFC:-NFC enables wireless payments through your device. You can also connect two NFC enabled devices just by touching them with each other.
Verdict - In my opinion, Asus ZenFone 3 is better overall performance and price ,if you need bigger battery you can go for Samsung Galaxy A7 (2017) .
You can also compare these devices on 91mobiles