How to Fixing Lenovo S850 no Service Issued, 100% Work

25 Sep 2015

How to Fixing Lenovo S850 no Service Issued, 100% Work – Got this posting from the comments one of blog reader, a lot people got this problems when modified Lenovo S850. Beside Lenovo S850 when you got invalid IMEI and no service issued on your device, you can fix it by restore the IMEI and it will fix the problems other then Lenovo S850.
I don’t know this guide can be use for other china device or just Lenovo S850 so if you try to another please give some word on comment.
No service is cause by NV file corrupt, so using flash tool we gone read back NV file and the flash it back to our device, if you do right this procedure than it will revive your device from dead. Please read careful step by step because it think it will complicated.

Disclaimer :
This guide for educational purpose only, We not responsible if your device bricked after following this tutorial. (DWYOR)

How to Fixing Lenovo S850 no Service Issued, 100% Work

Download

  • SP Flash Tool v3.1320 for this guide actually you only need the flash tool, you can use any version of flash tool but recommended to use v3 flash tool.
  • S850_ROW_S215_150114 ↦ 1.1 Gb, because this guide is for Lenovo S850 then you need to download Lenovo S850 stock ROM, for another china device then you need to search it on the need.
  • NV_RAM Lenovo S850 NVRAM block, cannot be use for another device.
How to Fixing Lenovo S850 no Service Issued, 100% Work
  1. Download all files and place on the same folder, so you can easy to search the needed files. Extract the both files too and then go to flash tool extracted folder, run flash_tool.exe for windows 7 or later please use administrator privilege 
  2. After you can see the flash tool windows, now press ALT + CTRL + V. This will make flash tool run on Advanced Mode, you can see on the flash tool windows bar. On the Download tab  click Scatter-Loading button and the navigate to ROM extracted then select MT6582_Android_scatter.txt this will load all ROM files to flash tool.
  3. Click Windows ↦ Write Memory this will add a tab, then select the Write Memory tab, like on the below picture
    How to Fixing Lenovo S850 no Service Issued, 100% Work
  4. Open scatter file that you find on the extracted ROM, using word pad or notepad. Search for NV word, you will see three address on the scatter file linear_start_addr, physical_start_addr and partition_size. Put the linear_start_add on the Begin Address (Hex) and partition_size on the Container Length (Hex)
    How to Fixing Lenovo S850 no Service Issued, 100% Work

  5. Click on Open RAW Data, select the NV_RAM file that already downloaded
    How to Fixing Lenovo S850 no Service Issued, 100% Work
  6. Last click Write Memory button, turn off your device because Lenovo S850 using non removable battery you must make sure that your device is completely turn off, connect your device to flash tool using USB cable and flash tool will recognize your device and begin to start flashing process, wait until you can see GREEN CIRCLE in the middle of flash tool.
  7. Done, disconnect then try to turn on your device and normal boot. See if the service already on and can be use on your device.
Done, Congratulations i hope your Lenovo S850 already fix and can be use to make call and receive messages again. Please leave comments if you found any problem or broken link regarding this guide 
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169 comments
    1. @andy suwito why don't you just put the "check the emmc write" thing as @ogi beng mentioned into your wtiting above ? i followed your instructions perfectly but my phone getting bricked right after i write the nv, dunno why but after read @ogi beng's then everythings getting clear … i checked the "nand flash" insted of emmc (yea since you don't mentioned it earlier @andy suwito).
      so .. be more cautious on your writing @andy suwito

    1. no, it not flash the ROM S215,
      when you have S217 then it ok use S217, the ROM need because you cannot use this method and flash NV_RAM if you don't have the full stock step 2.
      if will only flash of recreate NV_RAM on your device base on S215 MT6582_Android_scatter.txt

    1. the 0x180000 is different for every scatter file, look at your own scatter file.
      "Open scatter file that you find on the extracted ROM, using word pad or notepad. Search for NV word, you will see three address on the scatter file linear_start_addr, physical_start_addr and partition_size. Put the linear_start_add on the Begin Address (Hex) and partition_size on the Container Length (Hex)"

    2. when it still 0% and not moving then you must check your USB VCOM driver,
      " Install this driver first on your computer, Turn off your device and remove the battery, using USB cable connect your device while look at My Computer ↦ Manage ↦ Device Manager there will be MTK65xx Preloader Devices show up for 5 second than disappeared, before disappeared right click on it and select Update Driver Software point it to USB VCOM Driver extracted folder. When it finish disconnect and connect again there will be Mediatek PreLoader USB VCOM Port on your device manager."
      look at this guide to install it http://bit.ly/1moCD1m

    3. I dont understand with your think. How can the computer recognize your device if you dont install the usb vcom driver?
      When lenovo device is turn off and connect to computer it become mediatek vcom port and it need driver so computer will recognize it. When you not install usb vcom driver the progress will always 0% and computer will not respond when you connect your device

    4. well regarding that problem i have the same as @KyPaMuqHko
      where it wont turn on eventhough it charge or try to reflash
      the solution i can is to let the phone wont be use for several hour(depend on how many percent left before u start to write memory) and the recharge it, from there it will recharge from 0% then try to full reflash it and viola it still on but the network problem still there

      the next problem is when i tried to write it again the address change suddenly after click the write button from 0x1800000 to 0x0000001800000, no solution for this one

      any workaround for this andy?

    5. 1.already done that, writing the nvram, the red bar progress going then it no red bar bar but the progress keep going no nothing like the green circle and my s850 fail to turn on(like hard brick) again, but no worries i got its battery 15% left, gonna let its dried up and tries to do this process with new version of flashtool

      2.flash tool saying failed to open raw data that is NVRAM..
      im gonna check with latest spflash tool

      thnx for replied andy,will be back soon

    1. Hi, my phone no serial number after flashing vibeui via spflash tools , imei fix done, and the telco name appear, but still no signal. is this tutorial will fix it? and should i use that red number in the tutorial or use no in scatter file? thx for feedback

  1. hi andy im back sorry for very long reply yes i did fix but ur method is actually check emmc if not check i get into hardbrick (solution for hardbrick refer to my other early)
    with this fix i have the signal but very very weak

    1. yes maybe it need to check the emmc option. thank you for your correction.
      for signal problem i think you should change the modem file, maybe the modem file is not fit with your country provider, and above guide is just to bring back the NVRAM partition

  2. please i dont speak english, my phone s850 he seguido los pasos de su pagina pero me sale error la direccion de 0x1800000 invalida y no deja otra de todas las que hay en NV_RAM. THANKS.(my phone no signal..)please.please

    Hefaca

  3. it worked on the 1st go of trying… it seems complicated but all u have to do is just use some common sense …

    also on Memory Setting u must select EMMC, not Nand Flash (not like what is shown on the picture)…

    if everything done accordingly, once u connect ur S850 (during power off state) SP F tool flashes instantly like in 2 seconds u get green circle ….

  4. Ok i did everything on the phone using scater file from internet i found from s217 hex 0x14800000and part size 0x80000 and the nv file from post and get green circle and everything and now the phone is dead what should i do it is stuck on lenovo screen and not booting should i use hex 0x180000… and 0x500000 or ill make it worse

    1. are you already flash the ROM i include on the download section which is S215? there is scatter file for S215 on the download section inside the downloaded ROM and why you are using S217?
      redo it but flash your phone with S215 then fix the NVRAM. On step 3 dont forget select emmc rather than NandFlash. (important)

  5. Dear Sir…firstly Thanx a lot bcz when first time my lenovo stuck when i update my phone. that time i was follow ur post any its really works for me like charm. but now i have a problem unfortunately i format my phone when i update Lollipop. i repair IMEI number but i Felt to write s/n its show me 0000000 like this…so my network is not working…Wifi,Hotsport,Camera all are working gud only when i connect wifi its show me NV Ram error but its working…m using Row version 207…PLzzzz Help sir.

  6. click on EMMC
    Open scatter file that you find on the extracted ROM, using word pad or notepad. Search for NVRAM, you will see three address on the scatter file linear_start_addr, physical_start_addr and partition_size. Put the linear_start_add on the Begin Address (Hex) and partition_size on the Container Length (Hex).
    100% working

  7. hi. can help me.
    my s850 now currently rom version s216. can i downgrade 1st to s215 firmware then fix this error? im scare when downgrade it will hardbrick my device. help. i need get rid this no signal problem

  8. Hi andy ive come back to this blog and gladly to report to all of you that i got my lenovo s850 repair by my own with andy method.
    actually all the method suggested by andy is working like the flash nvram stuff.
    now i have full signal. after inspecting internally hardware actually the black antenna wire was crushed by the internal component so, i arrange back the black antenna wire and viola the signal is back. my theory is long before i got my screen replacement and maybe during that time the tech guys didnt notice the antena wire placement thus leading to no signal….
    so i place the black antenna wire back to its original place

    but hear my warning, i disassemble my lenovo s850 with my own hand and placed the black antena wire with no what so ever skill and understand the risk that will happen.

  9. Thanks Andy for solution , i will try it today , just want to confirm that it will work fine with my lenovo S850 with below info , can you please advise :
    Baseband version : S850.V106
    Build number : VIBEUI_V1.5_1419_2_ST_S850
    with no serial or IMEI

  10. Hello,Andy I flash my lenovo s850 before reading commets by selecting NAN FLASH.Now my phone looks like hard brick.I can't turn on my s850.Only black screen appears. How to solve it.Plz helps thank.

  11. Thanks Andy for the procedures , i followed the steps and my phone got IMEI but it's different than the original IMEI , and still no serial , when tried the phone slot1 still didn't detect any signal , only slot2 detects not-3g signal for calls only . Can you please support me in this .

  12. Hi, I download the rom S217 from your website and now I am having issues:
    1. In wifi, NVRAM warning is getting displayed.
    2. Imei number is invalid.
    3. I am getting no service all the time.
    Now, Hopefully I resolved the first 2 issues but I am not ahle to resolve the 3rd one (no service). I looked into the S217 rom for nvram file and flashed it as per the steps given above, but still no signal. Even I downloaded your nvram file and flashed, still no signal. Please help. I am on version S217.

  13. I had the same problem after i Reset my Lenovo S850 i was getting Invalid IMEI and SN number……. I did as it mentioned above but still my SN number and IMEI Number is displaying as Invalid So what should i so .

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