Whether to root your phone or not that is subject to you need.We will leave that too some other time. If you want to root your android phone then most recommended way is to go with PC method (ADB/Fastboot) and then root your phone. You can then use TWRP to install Super SU here.
ROOT Any Android Phone (PC Method)
Root OnePlus 3T Android Nougat 7.0
Root OnePlus 3T Android Marshmallow 6.0.1
Basic Rooting Guide All Android Device
INSTALL TWRP Recovery Video Guide
You can directly watch the video and can understand the steps,
INSTALL TWRP Recovery Steps
Follow the below steps to see how to install TWRP recovery.
Finding Files
The most important thing is finding the correct TWRP for your device., You can eaither chek the official twrp wbsite or you can check xda forum to get the latest news and updates for your device.
Take Your Time
Even though installing twrp doesn't cause to loose your data. But still take your time, backup everything, and collect the correct file. Once you done
Configure the PC
You need two necessary files, "ADB" and "Fastboot". There are few options you can have depends upon your requirement.
Configure The Phone
Enable Developer Options in your android device by heading into Settings, then scroll all the way down to the bottom and hit About Phone. In here, scroll down to the bottom again and tap Build Number seven times in rapid succession. Next, back out one level and you’ll see a new Settings menu titled Developer Options. Open this menu, then tick the box next to Enable USB Debugging and press OK on the subsequent popup.You can optionally also enable the 'Advance Reboot' too.
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Connect Your Phone/Tablet to Your Computer then unlock your device and you should see a dialog box asking you to Allow USB Debugging. Tick the box next to Always Allow From This Computer and tap OK.
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Actual Comands
Go to the directory where you have adb and fastboot exe files, do a “Shift + Right-click the mouse” in the blank space and select “Open Command window here…” from the list that appears. This will open a command prompt here. Now use these step by step commands,
adb devices
This will verify whether your phone is connected to PC properly or not, If you see status like below then you are good to go.
adb reboot bootloader
This will take your phone to bootloader, You can also use some of the device hardware combinations keys to go to the bootloader.
Unplug your cable from the device and then plug again.
fastboot devices
Now make sure fastboot commands are working properly,
Now the important command to install the twrp. Use the command
fastboot flash recovery twrp_recovery_image_file_name
This will install the TWRP recovery on your device If you see below message then
Dont just use the command "fastboot reboot" to reboot your device. First check whether TWRP installed or not, from the completely power-off state of your device press and hold the “Volume down + Power Key” then navigate to recovery mode. This loads TWRP on your device.
Use the power button to select and reboot to recovery. If the TWRP has installed successfully then you will see as below.
This is it the simple way to install the TWRP.
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