yashsingh1/xdaforums huggingface dataset:
[Thinkpad Tablet General] SM-T325 LTE:
So...please help reduce my ignorance. I've read this entire thread, incrementally, and while it's not as chaotic as some, I'm still left wondering about more than I like.

1) The "M" ROM from the Lenovo Russian site (YT3-X50M_S000127_161124_ROW_otafull_update.zip) is a complete ROM, not just an OTA update?

2) And THAT is the ROM you flashed (and subsequently removed) from your "F" device?

I've flashed/rooted all of my android devices so far but this tablet, and the less-than-overwhelming popularity of it and associated less-than-wide-spread support has me a bit hesitant. Just trying to get my ducks in a row. I've downloaded the file (only found the one (YT3-X50M_S000127_161124_ROW_otafull_update.zip) and the "update" in the name made me wonder if this will work over an existing "L" ROM. The "full" suggests, well, that it's a complete=full ROM.

Many thanks.
[Thinkpad Tablet General] 5T33Z0:
1. What makes a full Rom? Unpacked it's more than 2 gigs in size. You can download and extract it to see what's in it. I see boot.img, splashscreen.img and recovery.img in there. Seems that the system files get replaced by system.new.dat (2.1 gigs).

https://cloud.mail.ru/public/6yTn/cfNetdruk

2. Yes, that's the Rom I flashed. Because the F and M have the same CPU, afaik. And since F doesn't have a Modem I knew there would be a relatively low risk of hard bricking it.

What's the difference between L an M anyway? From what I know, M has LTE support. As far as I can remember I didn't see any M Versions to download on the Russian Forum, though. But I have a look again.
[Thinkpad Tablet General] SM-T325 LTE:
Perhaps you transposed L & M above regarding the ROM? Unless I'm missing something obvious, the only ROM on the Lenovo Russian forum (YT3-X50M_S000127_161124_ROW_otafull_update.zip) is for the M variant. The L variant is nowhere to be found (there or anywhere else), and think I searched diligently. And it's the absence of the L ROM (and, accordingly, the inability to revert to it in case of the sort of difficulty you encountered) which makes me hesitant about flashing the M ROM.

Actually, the L and M BOTH have LTE support. The M has a built-in PHONE as well, whereas my L is a data-only LTE device. So, while both have SIM slots, one is for data only, the other (M=mobile) for data/voice. AFAIK, the reason there is a difference is because Lenovo didn't find it convenient/profitable to get this L/M hardware certified for VOICE with either EU or US regulatory agencies, who hardly are fun to play with. My hope? Flashing the M ROM to my L device will give me voice support. BUT, the inability to FIND an L ROM hints at a critical hardware difference between the L/M platforms, even though several people have claimed NO DIFFERENCE.
[Thinkpad Tablet General] 5T33Z0:
Maybe you should just try to find the original firmware for backup and try to flash the M version.

In the Russian Forum ALL Yoga 3 Tab Roms are listed under X50M. So I tend to believe they are almost identical. The L & M are probably even more than the F to M Model.
[Thinkpad Tablet General] SM-T325 LTE:
5T33Z0 - like I said " The L variant is nowhere to be found (there or anywhere else), and think I searched diligently. And it's the absence of the L ROM (and, accordingly, the inability to revert to it in case of the sort of difficulty you encountered) which makes me hesitant about flashing the M ROM." I looked and looked and looked. No "L" ROM to be found (anyone with a link to it PLEASE STEP FORWARD!). You at least had stock ROM for yours.
[Thinkpad Tablet General] pasza_sadyka:
For 850M you have rom with android 6.0 here:

http://lenovo-forums.ru/topic/21754-yoga-tablet-3-прошивка-yt3-850m_s000114_161125_row-андроид-60/

U can try upgarde 850L with recovery and upgarede from sd card /unpacked file/ but before make .qcn file backup and after don't forget enter region code.

Remember - you doing this at your own risk :)

M.
[Thinkpad Tablet General] SM-T325 LTE:
Thanks. I'm not familiar with .qcn backups. Will have to research that, but if it will extract a complete ROM from my not rooted YT3-850L that will let me restore if I get in trouble, I'll give it a try. So far, I only saw where folks were using it to restore IMEI numbers that had been trashed.
[Thinkpad Tablet General] vector_int13:
Android 6 and Full Reflash for YT3-850M

Hi there is Android 6 Full Factory for YT3-850M

Goto ulozto.cz and find "yt3-850m-s000114-161125-row-otafull-factory-update-zip"

1) Take small SD Card (For example 2GB) and put file there

2) Insert to Tablet

3) Hold Power and Volume DOWN

4) Afrer vibration relase Power

This version can be used to upgrade any other version like PRC
[Thinkpad Tablet General] SM-T325 LTE:
THANK YOU! I'd googled for this and was convinced I'd never find it. But there it is on a Czech site. Fantastic. And it looks to be the 6.0 version as well. Really appreciate this. Downloading (slowly) right now. Thanks for responding.

EDIT: Oops...wow. Talk about a bad case of confirmation bias! I was looking for an "L" firmware. You clearly said "M" but I saw "L." So, the thanks were sincere, but misplaced. I'm STILL looking for that "L" firmware.
[Thinkpad Tablet General] vector_int13:
--------------------

Hi,

I searched firmware "M" for several weeks. I contacted Lenovo service and representation. Horrible company. Mainly, it will publish the source code, but if anyone has a problem with their device, so if he rushed into service. Why do service when it is a matter of 10 minutes flash. Ok Lenovo released the source code for the model L and M equal. It is the difference in LTE. Divergent is a model F. There are reports that it is L-flashing firmware M.

I'm not at the disposal of the L for the test.

The only thing I found a model L is firmwae "Farsi" (ARAB)

for example.

"QCN_YT3-850L_USR_S000027_1602020112_Q1241_ROW_qpst.zip"

Good luck.

My next tablet will be about another brand.
[Thinkpad Tablet General] SM-T325 LTE:
Vector_int13 - got a link for "QCN_YT3-850L_USR_S000027_1602020112_Q1241_ROW_qpst.zip" ? Any reason to think this ROM would be a "Farsi-only" version? Or should it allow language selection after flashing? Thanks.
[Thinkpad Tablet General] 5T33Z0:
All Roms I ever came accros have at least english in them. The programming language is basically english, so I am pretty sure you can select English. Even the chinese Rom I for the 850 had english and Chinese.

BTW, I think you draw the wrong conclusion from the absence of the L Rom. I assume it's not about hardware differences. It's all about regulations. I am pretty damn sure, the L and M are the same device just that the L has some sort of "softlock" to disable telefony. And thats why you never find it.
[Thinkpad Tablet General] SM-T325 LTE:
5T33Z0 - I think you're correct. See my separate post re: Three Devices but only Two ROM Source Code versions. One for F and one for L/M. Now: Where is that switch? Reports from those who installed M ROM to an F device indicate they got a PHONE app which was non-functional (no SIM). So I think we're barking up the right tree. Perhaps just a fresh flash would reveal it? Or might ROOT be required? I think we may be closing in on our quarry...
[Thinkpad Tablet General] TULTAL4:
Hello maybe I should open a new thread for this but I hope I might get help in this thread as this is the most relevant for my problem. I have a very basic understanding of android but have many IT experience so maybe you guys could help me out. the problem is I tried to ROOT my "YT3-X50L" with KINGOROOT using my PC and it has gotten to 100% and reported successful, unfortunately after a manual restart the tablet is stuck at the splash logo ever since. I can get to recovery mode but performing "data wipe/factory reset" wont resolve the problem (is shows "performing factory reset" at the last line but wont complete it apparently). my PC does recognize the device (its in USB DEBUGGING MODE).

my current firmware is: "YT3-X50L_S00024_160627_ROW"

I understand after a bit of research that I have soft-bricked my device. so here are some question I have:

1. the device is still under warranty will they accept it? I have done "remove root" from kingoroot hoping the tablet will come back alive to no avail.

2. if I get my hand on a firmware for the YT3-X50L as shown here:

w w w dlgsm com/index.php?dir=/FLASH-FILES/LENOVO/Y_Series/YT3-X50L

will I be able to flash it and recover my device? if so should I use ODIN and also wouldn't the BOOTLOADER prevent me from doing so?

3. would it be possible to extract a ROM from another exact device and transfer it to the bricked one?

4. every time I try to reboot it a new recovery log is created which is accessible from recovery mode can I somehow upload a log to offer more details for the boot problem?

sorry for the long reply I just really like to see past that annoying splash screen and use the tablet again.
[Thinkpad Tablet General] 5T33Z0:
1. If you temper with your device on the software level your warranty is void. You cannot just brick your phone and then ask for warranty :D

2. There are 2 approaches to solve the Problem

Option 1: If you bricked your device to the point where you can no longer access the Recovery or its storage via PC you need to use the QFIL Flashtool from Qualcomm (it's part of their QPST Installer Package). You cannot use Odin because that's (only) for Samsung devices. And you have to use a Firmware with "qpst" in the name, like

QCN_YT3-X50L_USR_S000021_1512231709_Q1241_ROW_qpst.zip for example.

There are youtube videos of how to use it. It's pretty simple if the drivers are installed.

Option 2: If recovery is still working and you have access to the USB storage you could try flashing the appropriate OTA Update. Since these packages are digitally signed they can be flashed with the stock recovery via "apply update from sdcard". But I don't know if it has to be placed in a special location on the sdcard or if you can browse to it. On my sdcard the tablet created a folder called "lenovoota" maybe that's where you put the file in.

Either way, you have to download the zip file, put it on your device and try flashing it.

Since I don't know which files Kingroot actually touches, I don't know if that will solve your problem, though. So I would actually recommend Option 1.

3. Uhhhm I don't know. I don't think so, because of the IMEI and stuff. But if you have the qpst Rom for recovery you don't need to do that anyway.

4. Possibly. But I can't analyze logfiles.

To actually Root the device AFTER reflashing stock firmware you need to:

0 Install necessary drivers for your Device and ADB

1. Copy twrp.img from Russian Lenovo Forum and supersu.zip (any) to the root folder of the tablet via PC

2 Unlock the Bootloader:

- Enable Developer Options (in Settings Tap Build Number 7 Times)

- In "Developer Options". enable "OEM unlocking"

- Restart the Device while pressing Volum DOWN to enter the Bootloader (Tablet stays at the Lenovo Logo)

- Connect it via USB to PC if it isn't already

- Unlock bootloader via fastboot command. Enter:

fastboot oem unlock-go

3. Run (don't flash) twrp via fastboot. Enter:

fastboot boot twrp.img

That restarts the device running TWRP Recovery (keep read only)

4. Flash supersu via TWRP, wipe Cache/Dalvik

Done. Reboot. Works like a charm.
[Thinkpad Tablet General] pasza_sadyka:
Ad3 Yes. TWRP

Wysłane z mojego Lenovo YT3-850L przy użyciu Tapatalka
[Thinkpad Tablet General] simonmbjornes:
Waoo. I would have expected a answer like that from a American not a German.

Maybe you should check up on consumer laws in your homeland and EU in general.

Software is definitely included in the warranty here. Especially when it is another builtin protection if you can call it that coursed it

You are allowed to root here and now that rooting is preventing updates.. That is consiteret a bug...

If it was the rooting it self that broke the device then yes you are not covered. But it is not. The rooting works fine. It is a buildin block.
[Thinkpad Tablet General] 5T33Z0:
I am pretty sure that you can't just brick your device by trying to root it and then send it back and say "hey i have warranty - fix this for me".

The question was not if rooting is allowed or not it was about asking for warranty if you f*** up your device by bricking it!
[Thinkpad Tablet General] pasza_sadyka:
In PL update to 6.0 is available for yt3-850l.

Sent on the move
[Thinkpad Tablet General] baltics:
And in the Baltics too.

Two stage overhaul:

Update 1 has 5.1.1 bug fixes.

Update 2 has Android 6.

The two updates have to be downloaded and installed sequentially.

The second wipes all data.
[Thinkpad Tablet General] pasza_sadyka:
First impresions. Works fast but... I only have horizontal mode :(

Sent on the move
[Thinkpad Tablet General] baltics:
Yes fast and stable.
[Thinkpad Tablet General] pasza_sadyka:
Autorotation works?

Sent on the move
[Thinkpad Tablet General] baltics:
yes, I use Nova launcher and it works just fine.

https://support.lenovo.com/gb/en/products/tablets/yoga-series/yoga-tab-3-8/solutions/ht501098
[Thinkpad Tablet General] pasza_sadyka:
I know. I upgarde but then autorotation stops working. Test says aceelemeter and magnetic field sensor is broken :(

Sent on the move
[Thinkpad Tablet General] luisangelchav:
Hi. I have the 850F, i know that exist the ROM 6 for the 850M, my question, can i install the ROM for M in an F.
[Thinkpad Tablet General] SM-T325 LTE:
Hmm... I'm now GUESSING that changing the REGION CODE. to one where "M" version is supported may be the key. No idea how to do that, but that makes some sense to me. ANYONE?
[Thinkpad Tablet General] TheAvatar:
I have been playing with the 850M ROM on my 850F and have not been able to get it to work.

I modified the build.prop and flashed it, it boots but I get SystemUI has crashed messages and can't get past the setup wizard so I went back to the 5.1.1 ROM.
[Thinkpad Tablet General] luisangelchav:
Hi, i flash the 850M 6.0.1 (YT3 850M S000114 161125 ROW) in my tab 850F, and, until now, work perfectly, only the autorotation dont work, i boot TWRP and install SuperSU and everything is fine.
[Thinkpad Tablet General] SM-T325 LTE:
1) Are saying that after SuperSU installation EVERYTHING is fine? Meaning that AUTOROTATION now works for you?

2) And, do you mind? Please tell me if installing the M ROM on your F device gave you a non-working PHONE/DIALER (which should NOT have been present on you F device before flashing the M ROM).

3) Were you prompted to change REGION CODE when you flashed the M ROM? May I ask WHICH REGION CODE (if any) you are using for your flashed device?

I'm still trying to sort some concerns about flashing the M ROM to my own L tablet.

Many thanks.
[Thinkpad Tablet General] luisangelchav:
1. Flash SuperSu and work fine, the autoratation dont work, i use appa for Play Store to rotate screen.

2. Yes, i have the dialer phone app and the messages app

3. I dont know nothing about Region Code, i dont change or something like that...
[Thinkpad Tablet General] SM-T325 LTE:
THANK YOU for your reply. You are helping me to piece together what has been (and remains) a tantilizing puzzle. Your experience suggests a minor incompatibility between the "F" hardware and the "M" ROM, based on the rotational problem. BUT, it also suggests that the PHONE app is integral to the "M" ROM and that I might be able to transmogrify my "L" into an "M" by flashing the "M" ROM from an external source rather than just accepting the waiting OTA update for my "L" device. It's intriguing, and it appears that the Yoga Tablet 3 user base is sufficiently small as to make me the designated "guinea pig" for this experiment. I'm collecting data before taking the plunge, and your reply puts me dangerously close to jumping...I'll certainly post the results of my findings. I'm still looking for info about "Region Code" concerns when swapping ROMs. Again, thanks.

Cheers,
[Thinkpad Tablet General] pasza_sadyka:
It's not a problem with a incoptibility hardware-rom. I make ota update my sister 850L from 5 to 6 and rotation stops working too. In test menu i see grawity sensor not work.

Sent on the move
[Thinkpad Tablet General] SM-T325 LTE:
Thanks for the clarification. Interesting. I wonder: would your sister's "L" have turned into a functional "M" with working phone if the "M" ROM had been applied directly instead of going the OTA update route? THAT's what I'm after with mine. Looks still as if I may be the first to find out how that approach turns out.

Cheers,
[Thinkpad Tablet General] pasza_sadyka:
I think its works. But its not mine tablet so i can't check. But You need .qcn file backup /for trouble with imei/ and on end input region code /if U are from EU code for Germany be ok/. U can read about this on lenovo-forums.ru and 4pda.ru /for egzample http://4pda.ru/forum/index.php?showtopic=687964&st=520#entry48057629 /

Where are U from?

Best, Martin.
[Thinkpad Tablet General] tapioco2000:
Is Helium the best app (without root) to make a backup?

I'd like to make a backup before upgrading to marshmallow.

Any suggestion?
[Thinkpad Tablet General] SM-T325 LTE:
Martin,

Again, thanks. My WiFi/LTE/Data Only Device does NOT have an IMEI number that I can locate. Which might complicated things in a big way. W/O IMEI, a device can't be registered as a phone on a carrier's network. I know there are ways of restoring and/or changing IMEI numbers, but assume that is for devices intended to have an IMEI in the first place. I've got a S/N and P/N but NO IMEI on my tablet. I suspect trying to make a phone from my "L" device is going to be more difficult than I suspected.

I'm in the US but my tablet is from the Middle East.
[Thinkpad Tablet General] tapioco2000:
On my "L" yoga tab 3 IMEI is stamped on the metal stand.
[Thinkpad Tablet General] SM-T325 LTE:
As it is on mine! I was looking for it through the Settings menu, and it wasn't showing up. Thanks for pointing that out. This gives a bit more confidence in flashing the "M" ROM directly from my SD card as opposed to just taking the (available) OTA update. Looks like I may still have to resolve the Region Code concerns if I do flash the "M" ROM. I don't want to lock myself out of future OTA updates just yet, so I have to sort out which countries will support OTA updates to the "M" device. Not the US, I don't think. And not sure about most EU countries, either. If I root the device, then that concern is moot, since that will kill the OTA update route.
[Thinkpad Tablet General] pasza_sadyka:
Russia. Ukraine. Bielarussia.

Sent on the move
[Thinkpad Tablet General] SM-T325 LTE:
Thanks. My guess is that Lenovo didn't bother to seek regulatory approval to market this tablet as a phone in the EU or US, but did market it where such restrictions and expenses weren't obstacles. Do you have any info on other countries in which the "M" device is marketed/supported, or additional info as to WHY the "M" version is so narrowly marketed? I hope it may be a bit broader than the three you mentioned, since the "M" ROM showed up on a Czech site as well, but I don't know if that means it's marketed there, or if the "M" is actually marketed and/or supported in countries beyond the three you cited. But, it's a curious marketing strategy for tablets in general. It's RARE to see a SIM-equipped tablet with phone function, and NONE are offered in the US (unless you count the Galaxy Note as a tablet..). Why not is a mystery to me, as a one-device-does-everything seems a useful if not always aesthetically appealing concept (i.e., tablet as speaker phone of BT-connected hands-free device: YES; holding an 8" or 10" tablet up to one's ear? No thanks).
[Thinkpad Tablet General] baxter01:
I"ve puted to micro sd crard rom from czech site and I"ve got 6.0 rom in my yt3-x50m but now I can't root by Kingoo have you any sugesstion how made root in 6.0?
[Thinkpad Tablet General] shile86:
pls can someone help!!!

I have Yoga Tab 3 Pro which i got from my brother that lives in Bejing. But when i turned on my new awsome tab i saw that it has Chinese sytem(firmware) or whatever its called i am not expert in tehnology. So there is no Google Store or anything google and i cant play my games from my android phone. Is there anything i can do to chamge my software to be on English and that it has Google store. Pls any help would mean a lot i am stuck for 2 moths with this useless Tab.
[Thinkpad Tablet General] SM-T325 LTE:
You may be able to flash the stock ROM from another REGION. But you should direct your queries to a section for the PRO version. This thread is NOT for the PRO. Good luck.
[Thinkpad Tablet General] yoanbonev:
Hi, Guys

Great lag solving solution is, unlocking the Developer options, and limiting the visuals and background process.(personally i can't notice any difference in usability, but the performance is insane) My yt3 is flying without any lag.

I can post what i did step by step if needed but, I never had this tablet running so smoothly before. Personally I love it(now even more) :angel:

Good luck and all the best,

Yoan
[Thinkpad Tablet General] tapioco2000:
On lollipop or on marshmallow?

It would be nice if you post step by step.
[Thinkpad Tablet General] yoanbonev:
Hi,

I'm currently on 5.1.1 (lollipop)

Theese settings will interrupt apps like messanger, skype, watsapp and viber from receiving any messages once you left the app.

So regarding to what you use the tablet for you might consider not to apply the settings I will post bellow.

To enable Developer Settings, you need to go to "about device" tab and find "Build Number" tap on build number 7 times and you will get a pop-up saying you are 4 clicks away from being Developer. Keep pressing it for few more clicks. Once that is done go to the open apps and switch them all off.

Go to settings and on the bottom of the list you will now be able to see "Developer Options"

Go inside and find (window animation scale, transition animation scale, animator duration scale) and switch them all off.

Then find force GPU rendering and switch this one on.

Last, but not least - on the bottom of the options you will find

(dont keep activities: turn this one on)

(Background process limit: my one id on sandart limit, it's down tk you how much you would like to limit the background processes.)

Once you apply these setting you will see the difference asap. After restarting please double check that all setting u have applied applied.

In case something didnt, clean dalvik cache. (Unlock recovery and bootloader : from the developer options tab turn on OEM unlocking, i have rooted my tablet with Kingo Root apk and it did great job.

Feel free to ask me if you need some further info.

Good luck to you all

Best,

Yoan
[Thinkpad Tablet General] SM-T325 LTE:
Just curious: is yours the YT3-850L or the YT3-850M? I'm trying to gauge the extent to which the "M" variant is available within the EU and (now separately soon, I guess) the UK. Thanks.
[Thinkpad Tablet General] pasza_sadyka:
M version is not available in EU. In official distribution.

Sent on the move
[Thinkpad Tablet General] SM-T325 LTE:
Thanks. That's what I've been postulating. Your confirmation is helpful. This may or may not have implications for my "L to M Conversion Project. At the least, I may have to set my Region Code to a non-EU country to keep getting OTA updates after flashing a non-EU M ROM.
[Thinkpad Tablet General] pasza_sadyka:
Russia or Ukraine will be ok. And don't worry about language. In non-china roms U have all languages. But i still think that qcn file backup is important!

Sent on the move
[Thinkpad Tablet General] SM-T325 LTE:
I'm also trying to capture the download link for my waiting OTA update, which would really nice to have as a static file. But, I've not been able to find the link using "adb logcat" for some reason. Hoping someone else has grabbed it and can tell me how. The .qcn may be the way to go. Thanks.