yashsingh1/xdaforums huggingface dataset:
[Android Q&A, Help & Troubleshooting] llBlackenedll:
Hi everyone, I decided to try to downgrade my S8-50F to KK a couple of days ago and my device will no longer work. I have followed https://xdaforums.com/showpost.php?p=64068624&postcount=1341 but it doesn't seem to work. Here's what I've done:

Followed the guide linked exactly. I used the "TABS8-50F_USER_S000143_1409291652_WW14_BMAIN_ROW_US" from the initial post, but with the Otkat XML (which also requires the *.fv file). After flashing, the S8-50F goes to the normal Lenovo powered by Android screen. It says "Boot Failed: EFI Hard Drive". As per some other suggestions, I then tried flashing the repair_BIOS. This removed the "Boot Failed" error but now the tab just hangs around on the Lenovo screen. After a long time, it eventually goes back into the opened up android screen (the same one you'd usually get with Vol Down + Power, says "Normal Boot" at the top).

I can see the device by running fastboot devices, but I cannot see it with adb devices. I presume this is normal when it's in this state, but figure it's worth mentioning.

I have also tried flashing the vanilla Otkat-less version of the firmware but that comes across the usual issue where it says "fastboot starting" followed by some EFI error (can't remember exactly what it is) so the flash never works). I have run the S8unlocker too (although that link doesn't work anymore) but it won't work anymore , maybe because I'm getting no ADB.

Anyway, my tab is now just sat around in the broken android screen. Are there any suggestions? I'v gone through these steps multiple times and in multiple variations but it never seems to work.

If anyone could help I'd be really grateful! Thanks in advance :)
[Android Q&A, Help & Troubleshooting] King Zlakh:
i forgot the pattern lock of my tab

i forgot the pattern lock of my tab , usb debugging is not enabled , and no cwm or twrp , i can boot into recovery and bootloader mode only

is there a way to open the lock screen without losing my data ? :( :eek:

my tab is s8-50LC plz help !
[Android Q&A, Help & Troubleshooting] Minto107:
If it's as you say. Most likely not

Sent from Galaxy Tab A10 with 7300 battery ;)))
[Android Q&A, Help & Troubleshooting] ...Saurav:
Pls help Intel flash tool lite not working pls help but tablet can access fastboot and bootloader menu mine is s850lc
[Android Q&A, Help & Troubleshooting] przemo10371:
I can only tell that you can try my fix package ( it might work)

it have 1.32 gb:

https://mega.nz/#!gNNTBSpK!jYe00sV41AuUY9dUkfvHzKowzjmDfCG72vHZ_zzK2Ag
[Android Q&A, Help & Troubleshooting] ...Saurav:
Mine is s850lc but the file in link is s850f ithink

And the biggest issue is Intel flash tool light not running showing this dialogue when opened pls help and guide me
[Android Q&A, Help & Troubleshooting] Minto107:
Have you tried reinstalling flash tool?

Sent from Galaxy Tab A10 with 7300 battery ;)))
[Android Q&A, Help & Troubleshooting] ...Saurav:
Yes several times and also re installed Windows 10 pls help and guide me to fix my s850lc
[Android Q&A, Help & Troubleshooting] Minto107:
Try different PC. If flashtool doesn't work there's literally nothing you can do

Sent from Galaxy Tab A10 with 7300 battery ;)))
[Android Q&A, Help & Troubleshooting] wujek22:
Please send backup S8-50L LC better lollipop Think :)
[Android Q&A, Help & Troubleshooting] retiredtab:
TLDR; I have a soft bricked tablet and trying to install lollipop from TWRP backup. My tablet was originally running lollipop.

Thank you to all the contributors and developers for supporting this tablet.

Long version

==========

I'm try to recover my S8-50F using the TWRP lollipop backup provided by social-design-concepts (sdc) in post#1.

I managed to get TWRP 2.8.7.0 loaded and was able to restore all 5 partitions successfully. There were no error messages during the restore process on the screen.

Upon bootup, the tablet shows the Lenovo logo and then goes into a blank screen (backlight is on). On my PC, I see two files in the LenovoTABdriver directory.

Lenovo_TAB_S850_V1.0.1.msi

MagicPlus_setup.zip

I have tried the TWRP restore multiple times and always get the same results. I have also booted into recovery mode and wiped the dalvik cache, data and cache partitions multiple times before and after the restore process.

I have read through the entire thread, all 275 pages, but perhaps because I'm a newbie, I'm missing the point of an important post or do not completely understanding the process.

I have also tried CWM and JazzROM lollipop provided here, but the updater binary always fails to execute in CWM.

My PC, USB to microusb, adb/fastboot all work correctly.

Any suggestions or tips or point to a relevant post that I made have not understood would be appreciated.

Thank you.
[Android Q&A, Help & Troubleshooting] Minto107:
Why dont you just flash official kitkat ROM and check if it'll work? If you've read whole thread you know its possible and its not really hard
[Android Q&A, Help & Troubleshooting] retiredtab:
Hi Minto,

Thanks for replying with this suggestion.

I carefully followed the instructions on how to install stock 4.4 and tried multiple times, but each time, the tablet is stuck on the Lenovo screen at bootup. When stuck, my PC cannot see it as adb, fastboot or usb.

There were no errors during the flashing procedure.
[Android Q&A, Help & Troubleshooting] Minto107:
But did you follow procedure to install 4.4 or to downgrade? You're downgrading is important
[Android Q&A, Help & Troubleshooting] retiredtab:
Yes, I followed the 5.0 downgrade instructions to the letter and it still doesn't work. I have tried multiple times. I'll try some more with 4.4 stock, but for whatever reason, my tablet just won't boot with the provided images.

Re 5.0, another user posted the exact same problem seeing the exact same two files as me with 5.0 TWRP backup/recovery and his problem was never resolved.

---------- Post added at 06:59 PM ---------- Previous post was at 06:46 PM ----------

I wonder if someone can upload a 4.4 or 5.0 TWRP backup of just esp.img and boot.img. These are two smaller files. I can try to interchange files around to see where exactly the tablet is hanging at.

Or if someone wants to upload their complete TWRP backup (4.4 or 5.0), I would be happy to try their image since the ones in the thread don't work for my tablet.
[Android Q&A, Help & Troubleshooting] Minto107:
Boot.img is 100% fine on your side as it gets flashed with firmware. esp.img (if I remember correctly) is responsible for IMEI and all that stuff(similar to Samsung's EFS) and your device should boot even if it's damaged. I bet that noone will upload ESP as it contains sensitive informations
[Android Q&A, Help & Troubleshooting] retiredtab:
The problem is above. After it boots into droidboot.img (the fastboot bootloader), Windows doesn't see the tablet again as a recognized device driver. That is why oem wipe ESP fails and all other subsequent commands fail as well.

There are posts in this thread about forcing Windows device manager to update the driver so that it recognizes the tablet after the droidboot.img reboot.

---------- Post added at 02:13 PM ---------- Previous post was at 02:04 PM ----------

Thank you making this zip file and taking the time to help others. I appreciate it.

I tested this zip file and there are numerous errors in updater-script. I managed to fix most of these, but it still doesn't help my case in getting my tablet working.

I'm posting to let others know they will have problems with the updater-script unless they know how to edit it.

---------- Post added at 02:18 PM ---------- Previous post was at 02:13 PM ----------

The updater-script has bugs in it. For example, line 101 is missing the ; at the end of the line so CWM will fail. Other commands such as set_perm set permissions to files that don't exist so CWM will fail.
[Android Q&A, Help & Troubleshooting] Minto107:
As @up said. Problem lies in drivers. Have you installed driver that was shipped with tablet? It should be in OP. It's only one I always used to install and I was able to flash everything without a problem
[Android Q&A, Help & Troubleshooting] celt0368:
Hi, if you are referring to the ADB drivers, yes I did install these. I've never had an issue with seeing the tablet from my computer. However when various utilities try to access the tablet via these drivers I often get the "adb server is out of date. killing failed to start daemon" messages. Win 7 tells me its "up to date". The PhoneFlashTool is able to access the tablet and reboot it , and others tools can speak to it.

Do you know of anyone in the UK offering re-flashing as a service? :) no one with a mac please (joke)
[Android Q&A, Help & Troubleshooting] Minto107:
Not ADB. Lenovo drivers

Sent from Galaxy Tab A10 with 7300 battery ;)))
[Android Q&A, Help & Troubleshooting] celt0368:
Are these the drivers (that were) visible on the lenovo device as a windows installer file (MSI)? I installed these.

Or are they from another location?

Many thanks for your advice.
[Android Q&A, Help & Troubleshooting] lukpol:
I have installed all of the required things and phone flash tool shows me

DEBUG : Nb devices connected: 0

But in the same software in provision section it detects Baytrail080963A1 device.

I browsed xml file for my wifi-only (s8-50f) device but flashing is not working

My system is windows 10/64bit
[Android Q&A, Help & Troubleshooting] Minto107:
Yeah that should do. If not go to Droidboot and then open windows device manager, it should be recognized as unknown device or something similar and then try to load drivers manually
[Android Q&A, Help & Troubleshooting] lukpol:
guys, can flashing stock firmware or doing repair bios cancel my warranty? Of course im not talking about bricking the tablet.
[Android Q&A, Help & Troubleshooting] Minto107:
Tablet itself is quite good, but Lenovo sucks hard. It would be great if we had any custom ROM that would fix Lenovo issues(at least those major ones) but as most people have already moved on, it's going to die on its own. I'll try to flash that memopad Nougat, will see what are the bugs and maybe I'll try to fix them and then release some bug fix package. ROM itself should be compatible, screen is what I'm worried about
[Android Q&A, Help & Troubleshooting] Robalo:
I visit this forum once every 3 months to see if something has changed, but now I see that after 2 years it's time to get rid of the last hope and get rid of this device. It would be really good equipment if it was not from Lenovo. Except the annoying lack of a lighting sensor! (BTW 'Display brightness' app is best way I found to help in this case)
[Android Q&A, Help & Troubleshooting] kmem:
I was trying to hold out hope for eventual software support too. Considering that no one was able to get a decent version of lolipop built for it, almost 4 years after it's release, I think we can safely give up such hope. Several devs have (supposedly) started working on it over the years but I have yet to see a single WIP ROM posted for it. Such a shame for a relatively stout device like this to die in such a manner. It is not like it has a locked bootloader which cannot be bypassed. At first I thought it was just the intel cpu that stifled development but there are other devices based on the same architecture that have seen plenty of 3rd party dev support. The s8-50's screen and speakers alone make it perfect for media consumption as well as general browsing, even 4 years later.
[Android Q&A, Help & Troubleshooting] Minto107:
The problem is. It's Lenovo. It's low interest brand and tablet wasn't selling too well or it wasn't advertised as it should have been. My actual samsung tab a10 has sh1t ton of ROMs, based on stock or cyanogenmod or if I'm not mistaken also Oreo(that Samsung promised to launch later this year, yes, for 2 years old tablet) and I don't even need to change software as Samsung is keeping it up properly. Its all Lenovo's fault
[Android Q&A, Help & Troubleshooting] kmem:
I agree 100% that Lenovo stinks at updating devices and that this device was not marketed strongly upon its release.

I just really hoped for support after reading several people's posts stating that they were "very close" to completing a working ROM. I kept close tabs on all the various s8 threads for years... holding my breath... I simply wish that these devs who were "very close" would have shared their work before abandoning it!
[Android Q&A, Help & Troubleshooting] younes_ysf:
SOLVED

hello everyone

at first, I apologize for my bad English.

I have this tablet (s8-50lc) for about 2 years.

I have rooted this tablet and its Android version was 5.0.1

4 days before I tried to reset factory the tablet when the tablet rebooted there was neither google play store nor google play service.

there was a notification that said google play music needs google play service.

when I tried to install the google play service, it said there is no google play service for your device.

I tried installing gapps from recovery but failed.(E: failed to verify whole-file signature" "E: signature verification failed" "installation aborted)

then i serached and found out that i need custom recovery

i tried installing a custom recovery by IntelAndroid-FBRL-07-24-2015

and recovery gone

there was no recovery mode anymore just fast boot and normal boot.

i tried flashing the phone with intel flash tool and "Lenovo_Tab_S8-50LC_LTE_Voice_S000200_150121" from mediafire

it was not succesfull. there was a an error with flashing modem.zip

and then every thing gone even fastboot mode

just big lenovo and "boot failed. EFI hard drive"

i tried "repair bios " solution.

now i just have fastboot mode and i can't flash the phone

i tried sp tools but it needs some scattered file that i dont know what it is.

i treid qualcomm lenovo downloader but it says i cant find row file

i treid intel flash tools with multiple stock roms but again failure with modem.zip and boot failed efi hard drive

PS: after many search i managed solving the problem with help of @Spitars in this thread: https://xdaforums.com/showpost.php?p=64068624&postcount=1341
[Android Q&A, Help & Troubleshooting] carkev:
hi,

I hope I'm in the correct forum?

I have recently bought a nice old Lenovo S8-50L on stock Android 4.4.2 rom.

It does data connections fine, including messaging, but cannot handle voice calling.

I was aware of it's limitations for voice -

but can anyone please advise there is a custom rom out there that would give voice calling capability?
[Android Q&A, Help & Troubleshooting] Minto107:
Install LC ROM. It has voice as well
[Android Q&A, Help & Troubleshooting] carkev:
:good: wow! - that simple. thanks very much indeed [MENTION=5387684]Minto107[/MENTION]

I have already been able to back my current rom with a temporary TWRP and flagged great threads here on roms and rooting but never gave your tip a thought.

I have been using XDA for many years and am not the greatest contributor, and am never surprised with all the knowledgeable advice to be had here.

I'll re-post when I have time to do the mods, but have an important bowls match today.
[Android Q&A, Help & Troubleshooting] carkev:
:highfive::highfive::highfive:

all has gone great! - I now have a rooted 50LC voice rom all backed up with TRWP.

I couldn't be happier

:highfive::highfive::highfive:

many thanks to [MENTION=5387684]Minto107[/MENTION] for his swift advice ...

to [MENTION=4758472]jazzespresso[/MENTION] for this great rom thread:

https://xdaforums.com/android/help/lenovo-tab-s8-50f-stock-firmware-rom-t2989791

to [MENTION=6102505]Hash.H[/MENTION] for this rooting thread:

https://xdaforums.com/android/help/official-how-to-root-lenovo-tab-s8-50-t2954375

and to [MENTION=4758472]jazzespresso[/MENTION] for the superb tutorial in post 90 of the above thread:

https://xdaforums.com/showpost.php?p=58934356&postcount=90

:good:

Kevin. Leyland. UK
[Android Q&A, Help & Troubleshooting] lukpol:
Does every single s8-50 has this blinking screen issue? Maybe software just reacts because of the broken hardware? I have the blinking issue on Kitkat and Lollipop but I use only Kitkat because sound on LP is so broken - it sounds like the people who are talking in videos are choking or something like that...

Anyone was able to fix it in a repair service?

PS. The blinking is very clearly visible at night with minimal brightness and white/bright background in movies. But it does not appear everytime. its not an overheating because I can experience this without charging and when battery is colder than my body temp.
[Android Q&A, Help & Troubleshooting] felixtaf:
Lenovo S8-50F turns off on battery

Hi

I have a Lenovo S8-50F for more than a year. It charges fine and works good, while plugged in. The battery holds charge too. But it turns off within seconds to few minutes on battery. When I press the power button, the screen blinks once and upon pressing again it boots. The battery level remains same before and after this issue. Any suggestions for this problem. Do I need a new battery?
[Android Q&A, Help & Troubleshooting] Silme_2013:
I had the same issue only it won't boot on battery - just the screen blink and going back to black. Booted fine with charger connected. I've just installed a used battery off ebay. So far so good - it's been running for more than 30 minutes now. Before battery swap it was in 2-3 minutes range. Will update if it reverts back to black screen
[Android Q&A, Help & Troubleshooting] felixtaf:
Thanks. Please let me know after a day or two. Much appreciated..
[Android Q&A, Help & Troubleshooting] Silme_2013:
It works. There has been one freeze but it's probably unrelated.

Also, the battery is very easy to replace - just open the back side, unscrew one screw, disconnect one connector and pry out the battery (there is some not very sticky glue). Put it back together and it's done!
[Android Q&A, Help & Troubleshooting] felixtaf:
Thanks for the info. Ordering a battery now :) :o
[Android Q&A, Help & Troubleshooting] kandalph:
S8-50L to S8-50LC

Yes, look at jazzespressos threat

Before doing it , make a backup of your firmware to be able to restore the original firmware.

It would also be nice then to upload the firmware/rom of your S8-50L because it is very rare.

Thank you
[Android Q&A, Help & Troubleshooting] Maheshwara:
I would really like to help you by uploading my firmware, but I do not know how to make a full backup of it. Usually, with other devices I do it with a custom recovery like cwm. As far as I know, this tab has a locked bootloader and therefore, can not be flashed a custom recovery on it. Is there any instruction how to make a full backup of all the ROM? I would really like to do so and upload it for you.

//Edit

Okay, I have to confess, that I did not read all the first page of this thread [emoji6] . Now I know, that I can at least boot from cwm via my PC to do a full nandroid backup. I think, I will get along now with this information.
[Android Q&A, Help & Troubleshooting] jazzespresso:
yeap becuase of locked bootloader, only way to make cwm work via PC connected. While it is connected your PC running CWM, you may do full backup to your microSD, and then zip them all, and upload it somewhere such as google drive, etc, and then others can download...please keep in mind when you zip cwm backup, don't zip data ones as it does not need..
[Android Q&A, Help & Troubleshooting] Maheshwara:
I think anyway, I will have to do backup twice - one time for myself with all my personal stuff and another time for you after having done a full factory reset... Or is all my personal data only stored in data folder and nowhere else?
[Android Q&A, Help & Troubleshooting] Sam00r:
It's stored on the "data" partition, just backup everything other than data and you'll be fine I think.
[Android Q&A, Help & Troubleshooting] Maheshwara:
Started CWM with device connected, but can not see any backup option [emoji20]
[Android Q&A, Help & Troubleshooting] kandalph:
CWM backup

You'll for sure find in this xda threat what you need.

Regards
[Android Q&A, Help & Troubleshooting] Maheshwara:
Seems that flashing instructions at post #90 do not work in my case... I am in download mode, device is detected, but flash tool does not flash at all remaining to 0%... Can anybody advice me how to proceed? Especially, a flash tool for Linux would be helpful... With [MENTION=6563151]kandalph[/MENTION]'s hints for Linux backup tooling, I was able to at least doing a backup.
[Android Q&A, Help & Troubleshooting] nachiket_xda:
I was playing ashphalt 8 while charging and I noticed that battery is swollen a little bit. Does anyone else has had this isuue? Is battery bulge covered under warranty? May be I will unroot it and go to service center for battery replacement
[Android Q&A, Help & Troubleshooting] kandalph:
flashing stock firmware is fake using CWM

I found out that flashing back from one of the S8-50/F/LC to S8-50L will NOT do a real firmware restore!!

After successfully restoring the device in KitKat is seen as flashed S8-50L. So far so good. BUT it won't accept any updates any more, although updates is/were found.

Why?

Droidboot sees the device still as S8-50F/LC and there is the problem!!

[IMG="after flashing still S8-50LC"][/IMG]

[IMG="Still S8-50LC instead of S8-50L"][/IMG]

[IMG="system update fails"][/IMG]

So, using CWM, the right ADB driver, FB_RecoveryLauncher and the factory USB cable for restore firmware/rom is NOT working for me, or I am doing sth wrong....

I flashed several times on this device and allways with the same result.

The only way flashing the WHOLE, lets call it, 'SYSTEM', is using Phone flash tool. This will flash the device as it should be.

I have a whole backup of my device S8-50L but am not able to flash it back. What can I do to make it compatible for using it with Phone Flash Tool to get it restored/flashed back to stock?
[Android Q&A, Help & Troubleshooting] Maheshwara:
By the help of [MENTION=6563151]kandalph[/MENTION] and own effords, I can now provide links for all the tooling required for linux:

Tethered CWM: http://xdaforums.com/dell-venue/general/linux-tethered-cwm-recovery-version-t2963104

Phone Flash Tool: https://01.org/android-ia/downloads/intel-phone-flash-tool-lite

Phone Flash Tool is a newer version than the one mentioned here - I hope this does not matter... Will try to flash LC version with it later...

[MENTION=4758472]jazzespresso[/MENTION]

Could you please insert these links to start post? Then all linux users can quickly find appropriate tooling.
[Android Q&A, Help & Troubleshooting] jazzespresso:
done..added that...
[Android Q&A, Help & Troubleshooting] jazzespresso:
you may probably need to update build.prob to reflect correct device name, and then try and see if it takes update.

also you said you have full backup of your device, what tools you use to back it up? why not zip your full backup and upload it somewhere so I can download and take a look.