[Android General] MotoJunkie01:
Lenovo Tab 3 8/TB3-850F -

Android 6.0 Stock Firmware Images

DISCLAIMER: As always, flashing your device - with either stock or custom firmware - involves an inherent risk of bricking or otherwise rendering your device inoperable. I am not responsible for any good or bad resulting from your use of these firmware images or this thread.

DEVICE SPECIFICATIONS:

Model: Lenovo Tab 3 8"(TB3-850F)

Android Version: 6.0 Marshmallow

Kernel Version: 3.18.19

Board Platform: MediaTek MT6735m (1.0 GHz)

Build No: TB3-850F_S100031_171010_ROW

Software Version: TB3-850F_160412

SDK Version: 23

Build ID: MRA58K

Android Security Patch Level: 9/05/2017

Build Date: 10/10/2017

NOTE:

First & foremost, these partition images will not restore your device completely back to factory/stock condition. They will restore your Android OS, boot logo, boot image & recovery to stock condition. Other vital partitions of your device, such as /lk (the primary bootloader) are not restored by flashing these images. To revert to an unmodified factory state, you will need to visit [MENTION=8243079]r&xp[/MENTION]'s thread mentioned below and flash your device with stock firmware using the SP Flash Tool, which will also re-lock your bootloader.

This firmware thread is not intended as a tutorial or guide for flashing or restoring your Lenovo Tab 3 back to stock condition. Rather, this is intended as a resource for stock images, device drivers, etc. However, some rudimentary instructions are provided, which will enable you to install these images and restore your device back to mostly stock condition. NOTE: IF YOUR DEVICE IS BRICKED (UNABLE TO BOOT INTO EITHER RECOVERY OR FASTBOOT MODE), THESE FIRMWARE IMAGES WILL BE OF NO BENEFIT. INSTEAD, PLEASE VISIT THE FOLLOWING THREAD BY XDA MEMBER [MENTION=8243079]r&xp[/MENTION] , WHICH WILL GIVE YOU THE NECESSARY FILES AND PRECISE INSTRUCTIONS FOR UNBRICKING & RESTORING YOUR DEVICE. https://xdaforums.com/android/help/lenovo-tab-3-8-tb3-850f-unbrick-root-t3598727

There are any number of available procedures to flash these stock partition images to your device. The simplest option is to use a custom recovery like TWRP to flash them. Store these images to your external micro SD (or internal storage if you do not intend to wipe internal storage or format /userdata). In TWRP's main menu, select "WIPE", "ADVANCED WIPE", and select Dalvik Cache, Cache, System, & Data. (For a clean install, it is recommended to format Data as well, by selecting "WIPE", then "Format Data.") Reboot Recovery (often necessary for proper mounting of the data partition). Now, select "INSTALL", then select "INSTALL IMAGE" in the bottom right of the menu, navigate to the storage location of the firmware images, and flash them in any order you choose. If you do not have TWRP installed on your device, XDA Senior Member [MENTION=6939319]Hemphiz[/MENTION] has a simple & comprehensive thread here: https://xdaforums.com/android/general/guide-lenovo-tab3-8-tb3-850f-t3559786/page1. In any event, whichever option you choose, please do your homework and research the threads here on XDA relating to your choice. These images may also be installed via fastboot mode. You will need to install Minimal ADB & Fastboot (v1.4 or later) on your PC, ensure the proper Lenovo device drivers & ADB drivers are installed on your PC, and connect your device to your PC via the stock (or quality equivalent) micro USB to USB data sync cable. Once in fastboot mode, open a command prompt in the adb/fastboot directory, and execute the following command lines:

fastboot devices (if you are properly synced, your device serial # will be shown)

fastboot oem fb_mode_set

fastboot flash logo logo.img

fastboot flash boot boot.img

fastboot flash recovery recovery.img (this will overwrite any custom recovery)

fastboot flash system system.img (fastboot will automatically sparsechunk this image)

fastboot erase userdata

fastboot erase cache

fastboot oem fb_mode_clear

fastboot reboot

STOCK PARTITION IMAGES:

The link below provides the following stock firmware images:

/system.........................Size 3.0 GB

/boot..............................Size 16 MB

/recovery........................Size 16 MB

/logo...............................Size 8 MB

Also included in the link are some helpful files like Minimal ADB & Fastboot v1.4.3, the official Lenovo USB Drivers for the TB3-850F (v1.1.21), a general partition index of the tablet, the ADB driver installer for Windows, and the latest PC version of LenovoSuite Mobile Assistant v1.4.1.14199.

I have made a full & complete partition dump of this device, including sensitive firmware partitions such as /oemkeystore, /nvdata, /seccfg, /lk, etc. In the event any members have corrupted these partitions, just request and I will upload these as well. (/nvdata contains device identifiers such as MAC Address, ESN, etc. The device from which these images were taken has since been hardware damaged & salvaged for parts. Therefore, I have no issue with sharing these images. However, as a disclaimer, you are fully responsible for the manner in which you use device ID partitions. Modifying a device's identifiers delves into matters of legality and ethical guidelines, all for which you are solely responsible.)

CREDITS:

Thanks to XDA Senior Member [MENTION=6939319]Hemphiz[/MENTION] for his hard work & development on this device, and his thread on TWRP & rooting. Also, huge thanks to [MENTION=8243079]r&xp[/MENTION] for his lifesaving tutorial on recovering this device from a soft or hard brick. His guide has revived many devices from the Android cemetery. You guys visiting either of these threads mentioned, be sure and hit the "THANKS" button for their hard work.

DOWNLOAD LINK:

TB3-850F_S100031_171010_ROW

Stock Firmware Partition Images: https://drive.google.com/folderview?id=1vRLwQ2mCD3CwYQZKGHyykDvBd2yGHisT