[Android General] MotoJunkie01:
STOCK ANDROID 6.0 MARSHMALLOW ROM

FOR THE LENOVO TAB 3 8"/TB3-850F

TWRP FLASHABLE ZIP

FORCE ENCRYPTION & DM-VERITY DISABLED​

DISCLAIMER: Your warranty will be voided by installing this ROM, unlocking your bootloader, or flashing a custom recovery. You hereby assume sole responsibility for any positive or negative consequences incurred by flashing this ROM. As always, flashing your Android device or otherwise altering its file system & partitions involves an inherent risk. I am not responsible for any devices which are bricked or otherwise rendered inoperable as a result of flashing this ROM. However, in such scenarios,

I will provide all support feasibly possible. Follow the simple instructions carefully and you should experience no adverse affects.

Lenovo's open source code for this ROM encompasses both the 850F & 850M variants of this tablet. Therefore, this ROM should be completely compatible with the TB3-850M as well.

NOTES:

This Stock Android 6.0 ROM is virtually unmodified. However, it should be noted that dm-verity (device mapping) and force encryption have been disabled via patched boot image. This is the most current stock OS for the Lenovo Tab 3 8"; therefore, no OTAs will need to be installed subsequent to flashing this ROM. In order to ensure that force encryption gets disabled, it is imperative that the /userdata (Data) partition is formatted in TWRP prior to Installation. Please carefully follow the below instructions.

For those members who want a pure stock experience, but also want root access of the stock OS, I'm currently compiling a deodexed & zipaligned version of this ROM, fully rooted with Magisk 14.0 & BusyBox binaries pre-installed.

SPECIFICATIONS:

Android Version: 6.0 Marshmallow

Build No: TB3-850F_S100031_171010_ROW

Kernel Version: 3.18.19

SDK Version: 23

Software Version: TB3-850F_160412

Build ID: MRA58K

Android Security Patch Level: 9/05/2017

Runtime Version: ART 2.1.0

Hardware Version: LenovoPad TB3-850F

Board Platform: MediaTek MT6735M

CPU: 64-Bit, Quad-Core Cortex A-53 - 1.0GHz

GPU: Mali T720 - 450MHz

RAM: 1GB

OS Build Date: 10/10/2017

Source Code: http://pcsupport.lenovo.com/us/en/products/tablets/a-series/tab3-8/downloads/ds112711

REQUIREMENTS:

1. Unlocked bootloader;

2. TWRP recovery;

This is a pure stock, unmodified, TWRP flashable Android 6.0 Marshmallow ROM for the Lenovo Tab 3 8". This ROM was compiled from the most recent stock /boot and /system images. However, as noted previously, the boot image has been unpacked, patched, and repacked in order to disable dm-verity and force encryption. Because raw firmware images were used in compiling this ROM, the file size is in excess of 1GB (approximately 1.35GB).

INSTRUCTIONS:

1. Download the ROM from the link provided and save it to your external micro SD card. Do not save to internal storage, as your /data partition will need to be formatted prior to installation;

2. Boot your tablet into TWRP recovery;

3. Wipe /system, /data, /cache & /Dalvik-ART cache. Also, select "Wipe", then "Format Data." This step is crucial to ensure disabling of force encryption. Please note that once installed, you may go to SETTINGS>>SECURITY and opt to encrypt the userdata on the tablet;

4. Select INSTALL, navigate to the location in which you saved the ROM zip file, and initiate installation. Flashing will complete in approximately 3 - 4 minutes;

5. Reboot system.

You should now have unmodified stock Android 6.0 installed on your Tab 3, as well as disabled dm-verity and disabled force encryption.

DOWNLOAD LINKS:

Stock Android 6.0 ROM --

TB3-850F_S100031_171010_ROW: https://drive.google.com/file/d/1iMf0Ns_XWGpYlNmXCvUsW_1DfaRMeIuO/view?usp=drivesdk

Stock Recovery Image: https://drive.google.com/file/d/1D6A7b080luzsSf0xLJSCqPBNeQLSWo94/view?usp=drivesdk

Unpatched Stock Boot Image: https://drive.google.com/file/d/1azgIrPbfJHBzZF9R4IUMxIGNga6vjipD/view?usp=drivesdk

Lenovo File Manager (APK): https://xdaforums.com/android/general/app-lenovo-file-manager-lenovo-tab-3-8-t3706161

Lenovo Tab 3 8" User Guide --

TB3-850F & TB3-850M (English)(PDF): https://drive.google.com/file/d/18gCTfuZecJnlB0ddBIN02YPaDpuvmzov/view?usp=drivesdk

Older Build(s):

TB3-850F_S100030_161209_ROW: https://drive.google.com/file/d/0B1Sfod4HWfk2aTNtVmJHZGpWZEE/view?usp=drivesdk

BUGS: Please report any and all bugs, no matter how seemingly trivial or insignificant. For those members with the knowledge, please submit a proper bug report. If you are not sure how, simply provide as many facts & details as possible. If you are having problems with apps, please specify as to whether the app is from Google Play. Also, please DO NOT submit bug reports unless you are utilizing this ROM in its present form -- unmodified, pure stock. Custom kernels, mods & tweaks (e.g. Xposed framework) & any deviations from pure stock will make it futile to analyze bug reports. Instead, provide with detail the precise nature of the problem. If reporting a bug, please specify if you are rooted (systemless or system-mode) and/or have BusyBox binaries installed. Submit screenshots of bugs if possible.