[Android General] pndwal:
No worries.

Re-posting all the useful stuff here (Including latest stock ROM and how To Enter TWRP):

UNLOCKING / ROOTING Instructions:

Originally Posted by [MENTION=1662557]mtpc[/MENTION]

Hey guys... I wrote down simple HOW-TO

[Slightly ammended by PW (Original Post #49 [MENTION=5273366]Lister Of Smeg[/MENTION]'s thread: https://xdaforums.com/android/help/lenovo-tab3-8-2016-custom-recovery-t3483454)]:

1) Copy SuperSU-v2.79-SR1-20161221223537.zip (or Magisk SU, etc) to the tablet

2) Enable Developer options (go to Settings, About tablet - click on Build number seven times until notified 'You are now a developer'). Go to Settings, Developer options - ensure OEM unlocking and USB debugging are enabled.

3) Open cmd (command Window) in folder with ADB and FASTBOOT

4) Type these commands:

adb reboot bootloader

Then:

fastboot oem unlock

Select vol up button when prompted.

5) Vol up button to select and vol down for 'ok' don't work in this screen, so hold down power button to reboot to system. (Operation will wipe all data for security at this point as per warning) Repeat step 2).

6) Repeat step 3) and type:

adb reboot bootloader

7) then type:

fastboot boot recovery.img (must be copied in the same folder as adb.exe and fastboot.exe)

(Don't flash recovery yet - system will replace stock recovery before you have root)

8) Use TWRP to install SuperSU (or Magisk etc). - Now you have ROOT (Systemless)

9) Repeat 3) and type:

adb reboot bootloader

10) Type:

fastboot flash recovery recovery.img - Now your new TWRP recovery will be permanent.

11) Use TWRP to reinstall SuperSU (or Magisk etc) as it is lost in step 10 - Now you have ROOT (Systemless).

To Enter TWRP:

After powering down wait at least 5 seconds after vibration, then press power, wait between 0.5 & 1 sec, then hold both vol up & down also (all 3 buttons) until vibrates. This timing is critical, but will boot to TWRP every time once you get it right.

LINKS:

Recovery.img and modified SuperSU are working from this Russian Rooting Instruction page:

http://lenovo-forums.ru/topic/22185-lenovo-tab3-a8-rasshirennoe-rekaveri-twrp-i-root-prava/

TWRP (twrp_3.0.3.img):

http://lenovo-forums.ru/applications/core/interface/file/attachment.php?id=67016

SuperSU:

http://lenovo-forums.ru/applications/core/interface/file/attachment.php?id=67022

Russian Unlocking Bootloader Instruction page here:

http://lenovo-forums.ru/topic/22153-lenovo-tab3-a8-разблокировка-загрузчика/

Latest Stock ROM:

http://lenovo-forums.ru/files/file/1549-lenovo-tab3-a8-tb3-850f_s100030_161209_row/

Which takes you to https://cloud.mail.ru/public/8T5R/RWCkuBz19

- About This File:

Lenovo Tab3 A8F - firmware TB3-850F_S100030_161209_ROW

Creator: Lenovo

Build Date: 09/12/16

Firmware type: Firmware for PC

File size: 1.14 GB

Archive password: lenovo-forums.ru

OS: 6.0

Description:

android 6.0

AOSP

Kid mode

ONLY WLAN!

Firmware for the Euro-region (including Russia and Ukraine)

Tip re VCOM connection in SPFT:

To allow Vcom driver connection, hold the volume down button and plug in usb at the same time while sp flash tool is in download mode. This trick was from [MENTION=5003632]stonedpsycho[/MENTION] originally.

4PDA Login:

I managed to create login for 4pda.ru Russian site. Any non-Russian speaking person who wants to axcess this great resource for many devices should study this:

http://doorsgeek.blogspot.com.au/2015/08/4pdaru-loginregister-captcha-tutorial.html (Hosted files are not available and links appear dead unless logged in)

Regards, PW