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How to restore the Lenovo A850’s stock ROM

lenovo a850 narrow

This is the latest tutorial in our series using the Lenovo A850. This time, after showing you how to install various custom ROMs, we’re now demonstrating how to restore the default ROW English stock ROM using Flashtool.

For this simple step-by-step guide, we’re going to be using a Lenovo A850 and using the Flashtool software to directly flash the ROW stock ROM over whatever operating system you might have on there already. The same process can be used to flash any ROM dump with Flashtool.

Before we start though, a disclaimer: by flashing over USB or installing custom ROMs, you may be voiding your warranty. We take no responsibility if your phone is damaged or bricked by following these instructions. Always backup your phone before altering its software in any way.

Initially, you need to make sure you have installed the Lenovo USB drivers. Download the drivers and the Flashtool as well as the ROM file itself. Be careful that you are using the exact version of Flashtool we’ve included here (v3.1316.0.150) as other versions might not work.

If you don’t have them on your computer already, you need to install the Lenovo USB drivers. First turn off the phone (don’t use the quick boot option) and take out the battery. Open up Device Manager and plug the phone in via USB – be ready to quickly right click on the device that appear and choose “Update driver”. Using the wizard, select the drivers you downloaded previously. If you are having issues, installing the drivers, use USBDview to ensure that you have deleted any existing MediaTek USB drivers that might be on your computer.

Next, unzip the ROM file and make sure you can open Flashtool on your computer. You are now ready to start following the instructions in the tutorial video below.

Embed this video:

All the downloads you need to follow this tutorial are linked here:

Flashtool + Lenovo USB drivers
Lenovo A850 ROW V17 S116 Stock ROM (v.2.3.5a)

What do you have installed on your Lenovo A850 – the ROW stock ROM or a custom ROM? If you like to use a custom ROM, which one do you prefer and why?

by Jon M

115 Responses to “How to restore the Lenovo A850’s stock ROM”

  1. Sherlock 29 May 2017 at 20:37 Permalink

    Hello, long time ago I flashed my phone and it was successful. Recently I have got a problem with the s123 rom and I tried to flash a new rom on my phone and always in the very end of flashing procedure I am getting BROM ERROR: S_CHKSUM_ERROR(1041). Please tell me anyone can tell me any solution if is it avalable. Thank you

  2. Ibrahim 6 March 2017 at 03:55 Permalink

    Hello…my phone can turn on but the phone laggy and getting hotter…it can charge but cant detect on pc…help me…

  3. puput 6 February 2017 at 14:33 Permalink

    after flash my a850 cannot on/boot,.. then i try to flash again but the error as mentioned above keep on appear…
    pls help….

  4. Pradip Kushwah 23 January 2017 at 14:15 Permalink

    Thanx Bhai/…
    Your advice very helpful to me…..

  5. jimy 12 October 2016 at 09:53 Permalink

    How To Fix “Unfortunately the process has stopped” Error On Android

  6. yugen 13 September 2016 at 13:11 Permalink

    i successfully installed new rom but it is showing invalid imei no. im from malaysia so how to tackle this problem

  7. Rizwan 21 August 2016 at 16:02 Permalink

    Please help to update my cell phone Lenovo A850, also i am faceing a problem

  8. bege 29 July 2016 at 09:33 Permalink

    My dead Lenovo S850 alive. Thank you

  9. nantha 16 May 2016 at 23:14 Permalink

    Hi sir, i accidentally format, how to recover it. I need help. Thanks in advance

  10. jomz 1 April 2016 at 08:36 Permalink

    how about my lenovo a850 just sudenly not able to open, even i long press the power botton

  11. Miey Ahmad 21 February 2016 at 16:59 Permalink

    Hello all…
    I just want to give several tips here regarding the phone not turning on with power button or recovery mode button or not even detected by PC at all.. Meaning, it stays blank whatever you do to it. My tips here as below :-
    1) Open SP Flash Tool
    2) Load scatter file of stock rom for this phone which is Lenovo A850
    3) Set to Download Only and then click Start
    4) Push Volume Up + Volume Down together and hold it
    5) Connect USB cable while doing Step 4
    6) Hold Volume Up + Volume Down button until PC recognise device and it will (in my case)
    7) PC will detect phone as MTK USB COM and will proceed with flashing
    8) FYI, this flashing will never finish and it will stop at around 86% (don’t worry)
    9) When it failed to flash, just click OK and then unplug USB cable
    10) Now choose Firmware Upgrade Mode and click Start
    11) This time, just connect USB cable without pushing any button
    12) PC will recognise device as Preloader USB COM and will start flashing
    13) This process will definitely finish and Green Tick Box will appear as you would see for normal successful flashing
    14) If everything done correctly, your phone will boot as usual (i hope)

    Anyway, hope my advice here will help you guys out there in reviving your phone.

    • anepp 23 February 2016 at 21:16 Permalink

      thank you very much! its work

    • Haikal 2 March 2016 at 11:37 Permalink

      Hello Miey Ahmad,

      Is this solution can be use for lenovo logo frozen at screen?

      Please advise


    • Nidsya 17 March 2016 at 18:44 Permalink

      Bro niey ahmad. I really need your help, this fricking usb shit is really stressing me af. I couldnt get my pc to detect my a850 no matter how hard i tried. Pleasee pleasee i really need your help. I dont know what to do :'(

    • Nidsya 17 March 2016 at 18:49 Permalink


      • Nidsya 17 March 2016 at 19:12 Permalink

        I got the green circle, but my phone wont turn on. I tried charging it but nothing happens except that little red light when im connecting it to the PC without battery. Ohmaigad its getting hopeless. Please anybody, help me please…

  12. yusri 22 January 2016 at 08:51 Permalink

    hi all, when my phone was infected, tried everything and from what i read this is the only method, but pls dont flash this rom, it will make your phone will never on forever and ever, the pc will not recognize your phone anymore,and your phone is dead, pls note that u cant do anything if pc not recognise your phone,not in the world,and ofcourse this guy and its better to have fucntion phone at least from a dead phone.. just want to help
    i already buy a new phone…

  13. amed 12 January 2016 at 14:45 Permalink

    after flash my a850 cannot on/boot,.. then i try to flash again but the error as mentioned above keep on appear…
    pls help….

  14. Alam 21 December 2015 at 15:07 Permalink

    i want a850 8gb rom flash file

  15. erwin 15 December 2015 at 07:07 Permalink

    hello sir, i need your help. i’ve been flash costum lenovo rom from a850 v17 row s128 to a850 v13 s203, its work well but when i flash a costum recovery like cwm recovery it wont boot into cwm recovery, it just stuck on lenovo logo.

  16. Farel 8 December 2015 at 19:28 Permalink

    please help my. why this error: BROM ERROR S_BROM_CMD_STARTCMD_FAIL (2005)

  17. yiewan 13 November 2015 at 09:47 Permalink

    help mnc i cannot open the phone after i flash your rom,

  18. vijay hp 11 October 2015 at 04:16 Permalink

    sir my lenovo a850 showing the reboot bloacking dl how to solve this problem plz help me adv tanks plzzz

  19. Arvin 21 September 2015 at 03:20 Permalink

    i cant get into recovery mode of CWM even if I already installed it… The device always boot in stock recovery… How to fix it? I used MobileUncle Tool to install CWM recovery

    • Arvin 22 September 2015 at 02:37 Permalink

      in my case, i install CWM using MOBILE UNCLE TOOL, i can get into recovery by the means of Mobile Uncle Tool option (INTO RECOVERY MODE) but manually, by pressing POWER + VOLUME UP, the phone just go to its stock recovery, which is chinese(because my A850 has a chinese stock rom 128 ver.)… Thats in my case, I hope admin knows the solution to this, maybe there is different buttons to push for you to go CWM recovery manually…

  20. Zeuz 14 September 2015 at 14:42 Permalink

    my lenovo a850 has a baseband version of a850.v13, the phone doesnt show when connected to any pc. and basically it has a chinese rom that i dont understand whatever is written. any help?

  21. Budakbesat 20 July 2015 at 04:48 Permalink

    Just need passion cause by USB connect/disconnect. this work great… thanx

  22. Rel 5 July 2015 at 21:28 Permalink

    Thanks a lot..Really appreciate you sharing this.

  23. O. J 23 April 2015 at 18:11 Permalink

    Hi, please can you help with the firmware for the Lenovo tablet yoga 2 830LC. I will appreciate it greatly. Thank in advance.

  24. Azhar shaik 25 March 2015 at 05:57 Permalink

    when i click on firmware upgrade its showing IMAGE ANDROID CHECKSUM FAILED,what should i do now??

  25. kasdi 24 February 2015 at 18:07 Permalink

    I cant open the flash tool….can you help me here..?

  26. g 12 February 2015 at 00:47 Permalink

    THANKYOU THANKYOU THANKYOU you really saved me from replacing my phone !!! your awesome !!!

  27. BRICKED!! 23 December 2014 at 17:42 Permalink

    i cant turn on my phone after following the tutorial.. can u please help me.. i don’t know what to do now.

    • BRICKED!! 23 December 2014 at 17:44 Permalink

      btw i cant even go to the recovery mode. it just stays blank.

  28. Igor 30 November 2014 at 13:57 Permalink

    After restore stock rom I loosed my Hebrew language ???
    Can you help me please..

  29. david 29 November 2014 at 21:37 Permalink

    after restore stock rom, i loosed hebrew language.( i didnt back up to old rom). can you help me restore or to install hebrew to my a850 lenovo?

  30. daniels 29 November 2014 at 18:13 Permalink

    MNC pleace upload rom backup s121 by linerty via cwm/twrp, or upgrade s128 to s129 ,coz i want try this rom or upgrade to my lenovo s128 but iam not understand obout pc for upgrade or instaling stock rom, please help, thanks

  31. Lim 28 November 2014 at 11:14 Permalink

    MNC please do answer for the question after follwing the toturial the phone cannot be turn on .already try luck installing the flash rom but the usb wont detect ..please mnc

  32. Winko 28 November 2014 at 10:19 Permalink

    I flashed this row yesterday and all went according to your tutorial as many others I cannot turn on my phone now can you suggest any thing I can do to get it to boot I have been investigating ADB and flashboot would they help?? AS other have said when I plug my phone in to my PC its no longer recognised. I would appreciate any assistance you can offer. Should I consider buying a new phone as this is a brick??

    Best Regards Winko

  33. phil 9 November 2014 at 13:46 Permalink

    will this work on an a850+ ?

  34. marvin 7 November 2014 at 03:38 Permalink

    hi there!.. i cant root my phone now after updating to ROW_S128. can any help me root my phone?

  35. Kaze 21 October 2014 at 01:05 Permalink

    Yes it is. I backed up from the settings. I restored it, but it is still the same.

  36. Kaze 21 October 2014 at 00:39 Permalink

    My phone visuals became weird after flashing the rom for moving apps to sd card please help me..

  37. anzack 17 October 2014 at 06:42 Permalink

    This thread doesnt seem to help anyone except to reply questions with questions. Its a bit lame if u asked me.

    • Mobile Network Comparison 17 October 2014 at 15:03 Permalink

      We’re doing our best to help people with limited information. Hundreds of people have followed this tutorial with zero issue.

      • mike 18 October 2014 at 03:51 Permalink

        and i appreciate your help,i along with everyone else who had bad luck should understand that we knew the risk before we took it,you are not being rushed,take your time..i appreciate your help and any more you may have

  38. mike 25 September 2014 at 14:28 Permalink

    as someone else posted,i got the lenovo a850 and It came with a malware spyware I rooted it to try to remove the spyware,i removed something i shouldnt have i guess, but it soft bricked my phone I followed this tutorial on this page using the Downloads on this page and following very carefully step by step the tutorial,and upon the confirmation of successful flash via flash tool(i got the green circle) then i unplugged my phone and tried to turn it on and it wont turn on,nothing works except the little red light,the light only comes on when the battery is removed and the phone is plugged in…it is confirmed that the adware on this prerooted device is infact spyware,be careful,the devices are rooted using kingo root which was confirmed to contain spyware,look on xda for the kingo root warning…can you help me fix this please? the phone wasnt even 2 days old when it broke..please please please please please help me

    • Bricked User 28 September 2014 at 16:36 Permalink

      I have had the same problem as mike. I followed the flash process led to the green circle coming up in windows at the end of the flash process (which suggested success) but now the phone will not turn on at all. Does anyone know how to resolve this?

    • Mobile Network Comparison 5 October 2014 at 17:14 Permalink

      What spyware and how did you know?

      • mike 18 October 2014 at 03:44 Permalink

        because ive used kingo root before and it has the same interface and same ads…you will notice on this phone,that your network will begin to slow down,even stop,as compared to what it should be on a reg 4g phone,now this problem will remain true even after you switch phones..

  39. azl 19 September 2014 at 14:19 Permalink

    hi. i have battery problem with my a850. i flashed with new rom and i notice that my battery presentage not correct with battery voltge. i install battery wiget and its show 3.5mv/4.2mv but, the presentage show 10%. i trying use battery calibration app and do it manually by deleting its batterystats.bin bit not work. help me to slove this. tq

  40. hazrol 15 September 2014 at 15:36 Permalink

    Hi.i cant reboot my phone atfer instl custom rom even after restore. Before root it ask to install supersu. But i can go to twrp recovery tool. So how to get my phone boot again. Tks

  41. Barry 29 August 2014 at 15:34 Permalink

    Dear MNC team – First- Thank you for the great tutorials. I just bought the a850 which came rooted and with build ROW_14.09.2013. (baseband Row.V15 2013/09/07). I’m a bit worried that the seller might have left malware/spyware (using some malware software it even indicated a possible trojan)and just in general I would love to create a completely fresh/clean install of an official rom.
    1. Is there a clean official google version I can install on this device, that also doesnt have all the unnecessary apps I have here? (I don’t even really need the Lenovo apps if they arent required)
    2. Is it possible to install 4.4 on this device reliably?
    3. If there is no such thing as a clean/official google rom for this device, what should I do just to make sure Im overwriting the current rom with a fresh no malware rom?
    4. Lastly – would any of this raise the issue of using the SD card for app storage?
    Would appreciate the pointers as I am moving from iphone and android roms and rooting is new to me. Whatever you suggest, i’ll find a way to implement through your great documentation but i just need the pointers.

    • Mobile Network Comparison 2 September 2014 at 02:54 Permalink

      Hi, thanks for your comment. This stock ROM is the cleanest plain version we are aware of but might be a bit out of date by now. We’ve not used Android 4.4 on this device yet but that doesn’t mean it’s not possible.

  42. prabhash 14 July 2014 at 17:14 Permalink

    yes i tried Vodafone and idea but still getting the same network not detected.

  43. prabhash 14 July 2014 at 11:52 Permalink

    i m using airtel sim card no network is showing

  44. prabhash 13 July 2014 at 06:30 Permalink

    I have install this rom but after installing everything is working properly but network not avaliable what to do please guide me

  45. oscar morales 8 July 2014 at 01:10 Permalink

    i got into the same problem too. i did it with the I also can not get into recovery. Please help me

  46. oscar morales 7 July 2014 at 23:29 Permalink

    friend you have the original files of the phone I lost the file recovery and brick phone

    • Mobile Network Comparison 8 July 2014 at 01:45 Permalink

      What exactly happened?

      • oscar morales 8 July 2014 at 02:19 Permalink

        trying to change the language does not make backup.
        and brick my phone. look for tutorials, original recovery file need phone to try to reverse brick. my phone does not turn on, only red charging light when plugged in to pc

        • Mobile Network Comparison 8 July 2014 at 02:26 Permalink

          But how did you brick it in the first place?

          • oscar morales 8 July 2014 at 16:40 Permalink

            The cellphone got bricked when i tried to install a rom that seems to no belong to the model it got fully bricked, the screen isn’t turning on and it have troubles connecting to the pc

  47. joe 4 July 2014 at 17:00 Permalink

    me too

  48. michael 7 June 2014 at 16:57 Permalink

    my phone cant turn on after do this….what should i do..

    • Mobile Network Comparison 9 June 2014 at 17:23 Permalink

      Can you get into recovery?

      • michael 10 June 2014 at 06:12 Permalink

        i cant get into recovery also…

        • Roy Osten 13 June 2014 at 15:20 Permalink

          i got into the same problem too. i did it with the “how to change storage tutorial”. Please help me!!!!! :'(

          • Tomas Arbeit 4 July 2014 at 00:03 Permalink

            I also can not get into recovery! 🙁 Please send the answer to fix it on email. thank you.

            • Mobile Network Comparison 8 July 2014 at 01:38 Permalink

              What method are you trying?

              • nizam ishak 24 August 2014 at 15:53 Permalink

                I got into the same problem also..cant turn on the phone..cant get to recovery..I follow the exact step from the tutorial..please help me

              • Arvin 22 September 2015 at 02:33 Permalink

                in my case, i install CWM using MOBILE UNCLE TOOL, i can get into recovery by the means of Mobile Uncle Tool option (INTO RECOVERY MODE) but manually, by pressing POWER + VOLUME UP, the phone just go to its stock recovery, which is chinese(because my A850 has a chinese stock rom 128 ver.)… Thats in my case, I hope admin knows the solution to this, maybe there is different buttons to push for you to go CWM recovery manually…

      • Jack0 4 November 2014 at 12:43 Permalink

        Hey MNC, have you got the solution to this problem? Phone not turning on.. My PC is also unable to find the phone after flashing it.

        • Rahman 23 June 2015 at 15:34 Permalink

          hi MNC..I got into the same problem also..cant turn on the phone..cant get to recovery..I follow the exact step from the tutorial..please help me

  49. Fabio Nascimento 7 May 2014 at 04:43 Permalink

    Dear friend, I bought this mobile recently from fascardtech. Unfortunately they send it locked as to the access to the actory mode, it appears in chinese but as you move up and down on the options and you press the power button, nothing happens. All of a sudden, the screen stopped responding from the middle towards the bottom, including the three touch keys. I flashed to a newer ROM but the issue persists. Please help me. Thank you in advance.

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