[Thinkpad Tablet Android Development] MotoJunkie01:
Lenovo Tab 3 8/TB3-850F

Stock Android 6.0 Marshmallow ROM

Rooted, BusyBox, Zipaligned

TWRP Flashable Installer

DISCLAIMER:

By proceeding further, please take note that your warranty will be null and void. You hereby take full responsibility for any positive or negative consequences which may incur by installing this ROM and, in doing so, you are absolving me from any liability in the event that your device gets bricked or is otherwise rendered inoperable. This ROM has been thoroughly tested. Follow the instructions carefully and pay attention to detail and things should go smoothly and without incident.

Note:

For members interested, I should note that I have compiled a build of this ROM with up-to-date security patches (June 1, 2018) and several custom features, which I will be posting in the next couple of days.

DESCRIPTION:

This is a Stock Android 6.0 ROM for the Lenovo Tab 3 8/TB3-850F. This ROM should also be compatible with the LTE variant of this device (TB3-850M), but such compatibility has not been confirmed. This ROM is the most current stock build available for the TB3-850F.

SPECIFICATIONS & FEATURES:

•Android Version: 6.0 Marshmallow

•Build No. TB3-850F_S100031_171010_ROW

•Software Version: TB3-850F_160412

•Kernel Version: 3.18.19

•Android SDK: 23

•Security Patch Level: September 5, 2017

•Build ID: MRA58K

•Build Date: October 10, 2017

•Root: Magisk v16.7-beta (Systemless)

•SafetyNet Pass (ctsProfile & basic integrity)

•BusyBox: v1.28.4 (Static Binaries) /system/bin/

•Zipaligned: /system/app & /system/framework

•Force Encryption Disabled

•dm-verity Disabled

•Init.d & su.d Support

•Optimized for Low RAM

•TWRP Flashable Installer

INSTRUCTIONS/REQUIREMENTS:

First and foremost, your device must have an unlocked bootloader and you must have TWRP custom recovery installed. If you need instructions on doing this, please see my thread here: https://xdaforums.com/android/general/guide-lenovo-tab3-8-tb3-850f-t3559786 Also, because installation requires the /userdata partition to be formatted, an external microSD card is needed.

1. Download the ROM zip from the below download link and save it to external storage;

2. Boot your device into TWRP recovery mode;

3. On TWRP's main screen, select Wipe>>Advanced Wipe and select Cache & Dalvik, then swipe to commence wiping;

4. Again, on the main screen, select Wipe and then select Format Data in the lower right of your screen. Swipe to commence formatting (this step is crucial for the disabling of force encryption);

5. Select Install, navigate to the location of the ROM zip, select it and swipe to commence installation (takes 3 to 4 minutes);

6. Reboot System;

BUGS:

No known or reported bugs...Please report any bugs or instabilities in comments.

Open Source Code: https://pcsupport.lenovo.com/us/en/...ies/tab3-8/za17/za170001us/downloads/ds112711

Mentions/Thanks:

•Thanks to [MENTION=7550078]pndwal[/MENTION] for his support on this device and assistance in my absence.

•Thanks to [MENTION=4544860]osm0sis[/MENTION] for his static BusyBox installer and Magisk Module.

•Thanks to [MENTION=4470081]topjohnwu[/MENTION] for his legendary and world famous Magisk Systemless Interface.

•Thanks and credit to the brilliant coder, [MENTION=5787964]SuperR.,[/MENTION] for his superb Windows version Kitchen.

•Thanks to [MENTION=6939319]Hemphiz[/MENTION] for breaking ground on the Tab 3 8" and for his guidance.

Download Links:

TB3-850F_S100031_171010_ROW: https://drive.google.com/file/d/1pKu1If-9Y9adeigUe5-HEBbqmFej5zYB/view?usp=drivesdk

Lenovo Tab 3 8/TB3-850F

User Manual (English) PDF: https://drive.google.com/file/d/18gCTfuZecJnlB0ddBIN02YPaDpuvmzov/view