Hello there!
Because there is not much about this procedure for this version I leave a tutorial that has worked very well for me.
Warning:
Backup all your data first, because when unlocking the bootloader of the device, it will reset to factory defaults and delete/erase all!
This guide is for people who understand the risks of flashing and is totally under your responsibility!
Before doing anything at all, read this post carefuly!
Requirements:
- Lenovo Yoga Tab 3 10.1 YT3-X50F (I don't know if this method runs on other versions)
- SO: Android 6.0.1
- ADB Fastboot
- TWRP Recovery v3.0.2.7 for YT3-X50F
- Magisk v14.0 or SuperSU
Links:
15 seconds ADB Installer v1.4.3:
https://forum.xda-developers.com/showthread.php?t=2588979
TWRP v3.0.2.7:
https://drive.google.com/file/d/0B6_OCYqbEKIac25wcjh6ZUFyZTA/view?usp=sharing
Magisk v14.0:
http://tiny.cc/latestmagisk
Chainfires SuperSU:
https://s3-us-west-2.amazonaws.com/supersu/download/zip/SuperSU-v2.82-201705271822.zip
Steps:
1.- Enable "Developer Options" on your tablet :
Go to Settings / About this device / Tap 7 times on "Build Number"
2.- Go to Settings / Develper Options / enable "OEM Unlock" and "USB Debugging"
3.- Install on PC "ADB-Setup-1.4..3"
4.- Connect the Tablet to your PC via USB
5.- Extract twrp.img in TWRP folder in your PC and enter it
6.- Open a command prompt (CMD window) inside that folder (Shift + Right click)
7.- Check if all works: type "adb devices" (without quots). If OK the answer shows a serial number.
8.- Then type: "adb reboot bootloader"
9.- Check again with: "fastboot devices"
10.- Finally: "fastboot oem unlock-go" (it will reset the device and erase everything, including your internal storage)
9.- Copy Magisk or SuperSU in microSD or internal storage
10.- Check again: "adb devices"
11.- Fastboot mode: "adb reboot bootloader"
12.- Check again: "fastboot devices"
13.- Flash custom recovery: "fastboot flash recovery twrp.img"
14.- Press and hold "Volume Up" button on tablet
15.- Reboot into Recovery mode, type: "fastboot reboot"
16.- Press "Enter" (The device reboot into TWRP Recovery)
17.- Release the "Volume Up" button when TWRP appears
18.- Slide to right and change the language (see the picture)
19.- Make a NANDroid/Backup of your system files in case something goes wrong with Magisk/SuperSU.
20.- Go to "Install" and select Magisk.zip or SuperSU.zip from internal sotrage/microSD
21.- Reboot
22.- Done!
Credits to the original creators.
Sources:
XDA-Developers
lenovo-forums.ru
HTCmania