yashsingh1/xdaforums huggingface dataset:
[Android General] smouge:
This i what I with Lenovo Tab3 10 business

>adb devices

List of devices attached

8HSKCMT4PJIZ9HDZ device

>adb reboot bootloader

>fastboot devices

8HSKCMT4PJIZ9HDZ fastboot

At this moment, on the Lenovo Android you only see a smaal line at the bottom: =>FASTBOOT mode...

The fastboot does nt deisplay errors, but after the following command, the tablet just boots in the normal Android. On the Android device I also saw quickly the message "USB transferring OK" before booting

>fastboot boot twrp.img

downloading 'boot.img'...

OKAY [ 1.192s]

booting...

OKAY [ 0.073s]

finished. total time: 1.269s

---------- Post added at 09:20 AM ---------- Previous post was at 09:03 AM ----------

On the Lenovo TAB3 10 Business I can also do the following:

Holding Vol up + Power when off and then releasing power when you see the Lenovo logo will bring up the following menu:

Select Boot Mode:

[VOLUME_UP to select. VOLUME_DOWN is OK.]

[Recovery Mode]

[Fastboot Mode]

[Normal Boot] <<==

With the recovery mode I see the following:

Android Recovery

Lenovo/LenovoTB3-X70L/TB3-X70L

6.0/MRA58K/TB3-X70L_S000020_170209_ROW

user/release-keys

Use volume up/down and power.

Reboot system now

Reboot to bootloader

Apply update from ADB

Apply update from SD card

Wipe data/factory reset

Wipe cache partition

Backup user data

Restore user data

Root integrity check

Mount /system

View recovery logs

Power off
[Android General] Hemphiz:
Chances are the twrp isn't compatible with your device. Although the hardware all looks the same. Problem is my knowledge with Android development isn't that great. I simply read in my spare time. The twrp I found for this device on a previous xda thread, but it was more of a Q&A so I made this guide to simplify things for people. I do know that the original twrp was made here http://4pda.ru/forum/index.php?showforum=583
[Android General] darknight83:
Worked great for me thanks. Had a few problems off at first but managed to get it done. First boot did take a little while but after that all is great
[Android General] MotoJunkie01:
This is a thread specifically for TB3-850F; however, this unbricking tutorial may be of benefit to you. https://xdaforums.com/android/help/lenovo-tab-3-8-tb3-850f-unbrick-root-t3598727
[Android General] stephenwhite:
Hi MotoJunkie01,

I follow the instruction:

My TB3-850M is off, open SPTool as admin, load Scatter file, press "Download", hold "VOL -" and connect USB cable, SPTool no Red line or Yellow line running. My TB3 just boot loop, as seen in the link below.

https://youtu.be/GPi9R6HhjYI
[Android General] MotoJunkie01:
It sounds like one of two things: (1) the vCom drivers are not correctly installed on your PC, or (2) the unbricking thread only works with the TB3-850F. Although the 850F/M both have the same users manual, and are very similar in appearance, they do run on two different MediaTek processors. (MT6735m for the 850F & MT8161p for the 850M). If checking your vCom drivers isn't the issue, you will need to find a ROM specifically for the 850M to flash with the SP Flash Tool. The ROM in the unbricking thread is specifically for the 850F.
[Android General] stephenwhite:
Hi MotoJunkie01,

Yes you are right, I reinstall MTK new drivers and it works. Now I can back to stock rom and prepair to root it soon. Thank you very much.

ps: my TB3-850M chipset is MT8735P with LTE call.
[Android General] MotoJunkie01:
Interesting, yet another 850M variant. Very glad you got it worked out. Follow the steps in this thread to the letter and you should have no problems rooting or installing custom recovery. You may already be aware, but the ROM you just flashed with the SP Flash Tool relocks the tablet's bootloader. So, it will be necessary to complete Step 1 in the instructions as well.
[Android General] Binerf:
TB3-X70F problem

Hi All,

I've tried this procedure on my Lenovo TB3-X70F (business ?) (following indication in page 2 of this post https://xdaforums.com/showpost.php?p=71689665&postcount=18) but now, I'm stuck in a boot loop with TWRP which can't do anything and reboot to fail again and again.

After installing TWRP (3.0.3-0 Tzul) and each time I go in recovery mode, I've got this window:

But screen is not active, meaning, click on any button has no action (even swipe button), so I've rebooted by long press on on/off physical button.

Now, when I boot the tablet, TWRP starts but stuck with error below:

I can still go in Fastboot mode but don't know what to do next.

Please, help.

Thanks for your help.

Edit: Basically, same problem than the one detailed in https://xdaforums.com/showpost.php?p=74605032&postcount=183 but for TB3-X70F
[Android General] MotoJunkie01:
Ok if you can boot into fastboot mode, you can safely recover your device. However, I am not familiar with your device model number. Please specify which tablet (product name), and which version Android (and build number), and I will try to get the files so you can fastboot flash your device back to a factory condition.

Edit...I searched your model number and it looks like you have the Tab3 10 Plus. Is this correct? Except for the 2" larger screen than the TB3-850F, the device specs seem to be very similar.

So, go to my thread here: download the firmware image files from the download link, and follow the fastboot instructions provided in the thread. https://xdaforums.com/android/general/rom-lenovo-tab-3-8-tb3-850f-android-6-0-t3593043
[Android General] Binerf:
Many thanks for your feedback.

So, basically, when I boot the tablet while pressing power + volume-up, I have the choice below:

[Recovery Mode] <==
[Fastboot Mode]
[Normal Mode]

I select "recovery" choice and arrive on the TWRP "Unmodified System Partition" screen but can't do anything on the touch screen (only physical buttons are active but has not utility but keeping screen on).

So, I plug USB on my laptop and type (I'm on Ubuntu):

$ adb devices
List of devices attached
VGFI895L5S4D5H9D recovery
$

Unfortunately, "fastboot devices" returns nothing.

So reboot tablet and choose "Fastboot Mode" in menu, so now, I get "=> FASTBOOT mode..." screen on the tablet but "adb devices" returns nothing so does "fastboot devices".

Any hints ?
[Android General] MotoJunkie01:
Ok, so while in fastboot mode, fastboot devices returning nothing is almost always a device driver issue. Have you downloaded the official Lenovo USB Driver installer for Windows from my download link? If not, please try installing it and then trying "fastboot devices" again.
[Android General] aquatrend:
will this work on YT3-850M

first of all, thanks for providing this guide MotoJunkie01 :D

I have some questions prior to try this guide:

1. will these steps also work for YT3-850M (Android 6.0.1)?

2. can I use the same twrp and SuperSU provided in this guide for YT3-850M?

thanks in advace
[Android General] MotoJunkie01:
Those are good questions [MENTION=710731]aquatrend[/MENTION]. I do know for certain that this guide works on the TB3-850M variant of the Tab 3 8, I cannot say for certain that the TWRP build will work on the YT3-850M. Let me get a bit more into from you so that I can give you a clear answer. First and foremost, what board platform does your device have? The TB3-850F has a MediaTek mt6735m, while the TB3-850M has a mt8735 and a variant with the mt8161. So if your device has one of those three chipsets, in theory, the TWRP build should be compatible with your device. In any event, a little tweaking would make it compatible. As for your Android 6.0.1 build, yes the SuperSU v2.82 systemless rooting zip will definitely root your device if flashed via TWRP.

Here's how you can test and not risk damaging your device. In fastboot mode, boot into this TWRP build instead of flashing it to recovery. Use fastboot boot twrp.img instead of fastboot flash recovery twrp.img. If your device boots into the TWRP build, and the touchscreen and functions work, go ahead and flash the SuperSU v2.82 root script.
[Android General] mcprescribed:
I put this on the TB3-850M (Chinese version) so I had less language issues but the dual sim and calling options now do not exist does anyone know of a rom that I can use instead?
[Android General] pndwal:
Latest official (1945-lenovo-tab3-a8-tb3-850m_s100036_171222_row) link at end of this page (Post #900):

http://4pda.ru/forum/index.php?showtopic=764969&st=880

(Links to: http://lenovo-forums.ru/files/file/1945-lenovo-tab3-a8-tb3-850m_s100036_171222_row/

Points to: https://cloud.mail.ru/public/DUSh/DSKyYawb9)

***Password to extract archives: lenovo-forums.ru

See links at top of same page (Firmware / Official firmware) for earlier versions. (Also Firmware / Informal firmware for ported Lineage OS 14.1 - not bug free yet.)

Use Chrome browser to translate Russian.

Hope it helps, PW.
[Android General] pndwal:
Hi MotoJunkie01

Did you notice TB3-850M now has working ported Lineage OS 14.1 (Android N - not bug free yet - See post above)? Would it be worth getting this to install / boot on TB3-850F? Regards, PW.
[Android General] MotoJunkie01:
Thanks for the link. I didn't know but this should be easy to port.
[Android General] MotoJunkie01:
[MENTION=7550078]pndwal[/MENTION] I'm not seeing the link for the LineageOS download. Can you post me a direct link please? Thanks. I'll work on porting it.
[Android General] pndwal:
Good that it should be easy.

Link from my post above works fine for me.

Go to first page mentioned (4pda.ru link), as I mentioned use Chrome browser to translate Russian (XDA Labs app with chrome installed also translates), see links at top of page (in clone of post#1) - in English, ie Firmware, hit +, Informal firmware, hit +, - Lineage OS 14.1 and Corsair Edition are listed, selecting Lineage OS 14.1 takes you to post #698 headed Firmware Lineage OS 14.1 (lists current bugs etc) and download link is at end of post (opens file link at yadi.sk - selecting 'download' works fine for me in Chrome).

***May need password to extract archives, ie: lenovo-forums.ru

Hope it helps, PW.
[Android General] MotoJunkie01:
Ok thank you my friend. I have downloaded the ROM and imported it into Cygwin Android Kitchen to start porting it. Wish me luck. The chipset on the TB3-850F, the Mediatek mt6735m, has thus far been very problematic to me in terms of development. This LineageOS 14.1 build should be a huge help. Much thanks for the link and info.
[Android General] pndwal:
No worries. Look forward to hearing re progress. All the best with it, PW.
[Android General] pndwal:
Did theTB3-850M ROMs help? PW.
[Android General] mcprescribed:
It did in a way but I have some issues where I'm stuck, I've used the .ru versions of firmware "TB3-850M_S100035_171017_ROW" and "Lineage OS 14.1 " but both have NVRAM warnings, wifi issues (most wifi works fine), and IMEI issues (some sims seem to work).

I can see on the forums there is a file, that likely fixes these issues "TB3-850M_nvram.img" (5 MB) but the link is now invalid for download, had some issues with TWRP as well where It doesnt seem to have permission to the data partition

I cant register on the forum because the validation image has Russian characters. at the the moment its pretty much a paperweight :(
[Android General] pndwal:
What were the warnings? (My understanding is that partitions altered by custom ROM (as well as modem and recovery partitions) do not affect critical data, eg IMEI info)

Did you alter or use software that alters other partitions (eg NV and OEM info, including IMEI & SN)? Or try to resize or adjust other partitions?

Be very careful what partitions you alter / try to repair.

To create login for 4pda.ru Russian site (break CAPTCHA code), see post #69 here:

https://xdaforums.com/android/help/lenovo-tab3-8-2016-custom-recovery-t3483454/page7

(Will take a little persistence, but you'll get there in the end). PW.
[Android General] mcprescribed:
I was using this thread;

https://4pda.ru/forum/index.php?showtopic=764969

but realised I didn't follow all instructions and got carried away as usual.

These are the instructions I followed, but I skipped the NVRAM backup, so I cant restore that file.

http://lenovo-forums.ru/files/file/1945-lenovo-tab3-a8-tb3-850m_s100036_171222_row/

This looks like a placeholder of all instructions for NVRAM things;

http://lenovo-forums.ru/tutorials/article/584-nvram-%D0%BD%D0%B0-mtk-%D1%83%D1%81%D1%82%D1%80%D0%BE%D0%B9%D1%81%D1%82%D0%B2%D0%B0%D1%85-%D1%80%D0%B5%D0%B7%D0%B5%D1%80%D0%B2%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5-%D0%B2%D0%BE%D1%81%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5/

I will have a go at creating my own file from this link maybe;

http://lenovo-forums.ru/tutorials/article/561-kak-vosstanovit-nvram-s-pomoschyu-maui-meta-3g-i-sp-meta/

Thanks for your advice.
[Android General] pndwal:
Yes, sad you didn't make nvram backup. (Live & learn!). Do you know what went wrong during flash, or affected partitions? Did you use wrong download agent or scatter file? Did you flash TB3-850M_S100035_xxxxxx_ROW, TB3-850M_S100036_xxxxxx_ROW, or both? Lose power or connection during flash? Guess reflashing didn't help...

Edit: yes, looking like your symptoms (wifi issues, nvram warnings) are indeed symptoms of corrupt nvram (Contains IMEI no. etc), -I guess from bad flash attempt -not problems with ROM data which shouldn't affect this partition. See here:

http://lenovo-forums.ru/tutorials/article/293-nvram-признаки-и-методы-проверки-повреждённого-nvram/

Please provide link where you found "TB3-850M_nvram.img". I'll try to get it for you. PW
[Android General] mcprescribed:
Thanks for your advice thus far!

I got the file by registering on the forum, thanks! Prior to that I tried using Maui Meta and eventually got it to recognise the device on version 8.1512.0.0 (I uninstalled the Lenovo usb driver after a lot of trial and error), I got stuck at the download IMEI screen, when it was asking for a database file which I dont have). I have put this on hold for now.

I might flash the nvram.img with adb but will I still need to actually amend the IMEI records in the image?
[Android General] mcprescribed:
That seems to have resolved the wireless error (with the NVram error), but now the one SIM I had working doesn't connect.
[Android General] pndwal:
Well done with Russian captcha and PC software!

I think you'll need to restore IMEI (and possibly SN and other unique numbers) to get Sims working. Links to utilities on pages you found, eg Creating your own NVRAM: http://lenovo-forums.ru/tutorials/article/566-как-восстановить-nvram-с- помощью-imei-and-sn-writer/

One IMEI is assigned per Sim slot. "As a rule, IMEI is indicated in four places: in the device itself (in most cases it can be displayed on the screen by typing * # 06 # on the keyboard), under the battery, on the package and in the warranty card. IMEI plays the role of the serial number of the device during authorization in the network, it is broadcasted during authorization on the network. IMEI is also used for tracking devices and blocking stolen phones at the cellular operator level, which does not allow further use of such a device in the network of this operator, but does not prevent its use in other networks." - (http://ru.wikipedia.org/wiki/IMEI)

Hope you are successful in restoring these numbers etc. All the best with it, PW.
[Android General] mcprescribed:
Thanks for your help, I certainly would have given up without your assistance! I managed to follow the first parts of this;

http://lenovo-forums.ru/tutorials/article/561-kak-vosstanovit-nvram-s-pomoschyu-maui-meta-3g-i-sp-meta/

I had to get the BLPG file from somewhere else.

https://forum.gsmdevelopers.com/android-china-clone-copy-phones/18215-mtk-database-files-uploaded.html

I managed to get the IMEI 1 and 2 records restored, it still says no service on the tablet but I will try test with a few other SIMS first before looking at the next stages..
[Android General] pndwal:
Well done - I'm sure you're well on the way to cracking it.

Things that cross my mind:

Are you sure IMEI no.s are correct?

Do other no.s (Mac BT, wifi, SN etc) all appear?

Did you perform initial nvram clean recommended?

Tried reflashing stock (clean flash) since?

Stay on it! PW.
[Android General] Ninad Joshi2202:
will this guide work on the tb3 750f?

will itwork or it will create some problems to my device?
[Android General] pndwal:
If you mean Unlocking bootloader, Installing TWRP, Attaining superuser privileges (root) on TB3-850F, you should have no problems.

I'd keep stock ROM. (Apply OTA updates first as OTA won't work with custom recovery.)

No custom ROMs available as yet, and some problems occurred with modified stock here: https://xdaforums.com/android/general/rom-lenovo-tab-3-8-tb3-850f-t3617594 (see post #101 and previous posts)

Re pending port to Lineage OS 14.1 (Custom, Android N - not bug free yet), see posts #101, 109 (link above).

My instructions (posts #66, 71) here: https://xdaforums.com/android/help/lenovo-tab3-8-2016-custom-recovery-t3483454. Im using Magisk Root (no problems) rather than SuperSU as I like to use Magisk modules (Viper audio etc). PW.
[Android General] Ninad Joshi2202:
thanks for the answer. but my device model is tb3 710f so the one's posted for tb3 850f would not work right?pardon my english.
[Android General] pndwal:
Sorry, I was viewing in XDA Labs app which annoyingly doesn't display bold title in posts, so I didn't see that you have another model (tb3 750f? Don't think this is right. Guessing tb3 710f is right).

So most likely flashing tb3 850f (wrong) TWRP will not work at all, or will cause unexpected problems for you. Flashing wrong ROM is likewise dangerous, unlikely to work, more likely to brick your device.

The rule is, only flash firmware / recovery specifically for your model unless it can be confirmed it is compatible with your device also. (This would be rare as partition tables as well as many other factors differ from model to model.) OTHERWISE DON'T DO IT! PW

---------- Post added at 01:26 PM ---------- Previous post was at 12:37 PM ----------

There are a number of threads for tb3 710f on xda with TWRP and official ROMs, eg: https://xdaforums.com/android/development/tb3-710i-tb3-710f-rom-stock-rom-lenovo-t3437810. Look for files from senior member [MENTION=5919159]Tzul[/MENTION]. PW
[Android General] mcprescribed:
Seems like all is working, I may have actually broken the ee pay as you Sim I was using to test on. But the voda sim and Bluetooth all work! Amazing, hopefully it works stable, will soon hear about it from my ungrateful girlfriend ;)

Thanks for the advice!
[Android General] pndwal:
Fantastic! - Knew you'd get there. (Guess the girlfriend story is another one.)

Did you restore with completely wiped nvram?

Perhaps you could post brief outline of your critical (successful) steps (including the links to utilities / tutorials on Russian 4PDA and Lenovo forums) here for others in same predicament. It would likely be appreciated by a few adventurous users in future. PW.

---------- Post added at 02:29 AM ---------- Previous post was at 02:15 AM ----------

PS If you use tablet rooted, Magisk's out-ofthe-box ability to pass safetynet check may help you with payment apps etc. PW
[Android General] mcprescribed:
I didn't completely wipe NVram, I just used the img file from the forums and then used the software to put back in the relevant IMEI codes.

I'm not sure I would be able to write a guide or step by step on what I did but I will subscribe to this topic in case I can help! Thanks again.
[Android General] MotoJunkie01:
You can repair pretty much any corrupt partition by using fastboot mode to flash a dumped image to your tablet. Which partitions do you need, just the /nvdata.img?
[Android General] pndwal:
Thanks.

Assume you flashed TB3-850M_nvram.img from TWRP or adb? (I found this on 4PDA site too - here: https://4pda.ru/forum/index.php?showtopic=764969&st=20#entry53774311 post#41, referenceed under 'useful' in clone of post#1 at top).

Could you mention which software in particular served you to restore the two IMEI numbers? Several are mentioned in your link to 'instructions for NVRAM things' in post 203. (Ie. SN Write Station tool, IMEI and SN Writer, Maui META 3G and SP META).

Did you need to fix nvram MAC-addresses to sort out your Wi-Fi problems? (May still need to do this - eg with SP META tool.)

Glad you got it going and all the best with it. PW.

---------- Post added at 06:33 PM ---------- Previous post was at 06:09 PM ----------

Yes, he restored basic nvram using TB3-850M_nvram.img from 4PDA site, but still had wifi issues, nvram warning messages, and SIM cards not connecting, so had to use utilities from Russian site (lenovo-furums.ru) to restore IMEI numbers also. PW
[Android General] mcprescribed:
The nvram.img was place via adb, which solved the WiFi issue for me (although from what you are saying my MAC address maybe classified as a cloned address now).

I believe I then eventually got the device to work on Maui META 3G ver 8.1512.0.0, I remember having driver issue where I definitely had to uninstall the official Lenovo USB drivers and I may have even turned off driver enforcement to get it working, I tried approximately 5 version of Maui META to get the device to come up.
[Android General] pndwal:
Great! That's useful information - especially regarding version of Maui META 3G that recognised TB3-850 device.

Your conclusion re. WiFi MAC address is likely right. Glad it's going through. Appears SP META tool may be best bet if you want to fix this.

I'd be inclined to double-check that IMEI_1, IMEI_2, MAC-addresses for Bluetooth, MAC-addresses for Wi-Fi, as well as SN are all actually correct in NVRAM (since need to restore corrupted NVRAM makes it likely all these values have changed) to prevent future problems / heartache (with your girlfriend :)).

Thanks for your insights, PW.
[Android General] AhmedZalabany:
plz can anyone help me

i have lenovo tab model Tab-7304l

Tb-7304l_S000046_180127_ROW

i want to root it and install any custom rom or downgarde it from android 7 to android 5 or android 6 becz its 1 giga ram and its to slow plz help and sry for my bad english
[Android General] pndwal:
This is latest Lenovo Tab 7 Essential (Lenovo TB-7304F/I/X) with N.

Appears it's been difficult to get root on Lenovo devices since N. Even Russian enthusiasts haven't got it done yet, so you shouldn't try. No custom ROMs available yet for Tab 7 Essential in any case.

Good general discussion here (it's for your device despite erroneous Tab 4 designation):

https://4pda.ru/forum/index.php?showtopic=850194

Use Chrome browser to translate Russian.

I'm watching this too as my daughter has Tab 7 Essential (Lenovo TB-7304F).

Your best bet while waiting may be:

1) RAM Booster / cleaner type app from playstore (there are many) that can kill background running apps as well as background wallpaper, launcher, etc, to free RAM & boost speed.

2) Replace full-featured but RAM intensive apps (Disable preinstalled ones) with lite 'Android Go' optimised apps (designed for low RAM devices). These streamlined / light apps are already available from 'Comparable app available' notice in playstore. [Eg. selecting Maps (Google) notifies you that Google Maps Go is available as Comparable app]. This makes it possible to manually achieve some of the 'Go' optimisations without Oreo.

3) Of course, killing background apps by clearing list from 'Overview' (old 'recents', 3rd) button regularly (make it a habit) will also keep tablet running faster.

Hope it helps, PW.
[Android General] AhmedZalabany:
Thank you very much and i will waiting