Lenovo A850 sim card not detected, imei baseband missing unknown

Lenovo a850 problem with SIM card undetected because missing of Imei and baseband info lead to comm failure.

lenovo a850
sim card inserted but not detected in android system

Even though SIM card is inserted, but notification remains with SIM card not inserted

lenovo a850
no sim card inserted while it already insert.

Cause of the problem
User said it suddenly happened after he changed SIM card

Corrupted nvram may cause from system update or suddenly remove simcard so that as a precaution turn off handphone before removing the SIM card to ensure system data were not affected or corrupted and if any ongoing system update do not turn of handphone until everything complete. Also do not remove the battery while the system still running, shut down the system via the off button first then remove the battery after the completed turn off.

Check Out: Lenovo s650 Imei baseband Missing unknown sim card not detected

Problem solved

Root your phone via framaroot
Install ROM toolbox lite from Google Playstore

lenovo a850
this photo taken after the previous nvram deleted, just to show you where it located through rom browser. and it is regenerated back after restart. data/nvram

And delete nvram folder inside ROM toolbox lite on Root Browser : data/nvram
Before deleting nvram folder copy and backup somewhere first in case of software brick.

lenovo a850
signal regain, sim card detected

In 10 Secs SIM card will regain its signal, restart your phone,
Nvram folder will be recreated back
While SIM card will be detected again and can normally makes calls or data.

If you unable to do it, send your handphone to us, we will fix it for you with little charges. 0142871121

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10 Replies to “Lenovo A850 sim card not detected, imei baseband missing unknown”

Mr Dean

September 26, 2015 at 2:59 pm

i just wanna say thank you so much.. i follow ur instrusction and its work.. but i didnt use framaroot software.. always said webpage was block.. so i try to use kingroot.. thanks so much.. 🙂

Reply

    atozcsdotnet

    September 26, 2015 at 3:17 pm

    good sir 🙂

    Reply

Rafi

October 17, 2015 at 9:18 am

salam sir. i got the same problem but not cause by removing simcard or battery etc. in case, my phone cant detect simcard after my bad luck had to tried flashing custom recovery on this phone using app mobileuncle tool mtk. so, i have following your instruction with using romtoolbox and delete data/nvram . but nothing happen and i try to restart and do again. but nothing happen too.

Reply

    atozcsdotnet

    October 17, 2015 at 9:46 am

    u can try manually insert the imei coz some other reader success by doing this also install back official version,
    you can try an error

    Reply

      Rafi

      October 17, 2015 at 12:51 pm

      how to insert imei number manually? where i can get that imei?

      i try key in *#06# but the imei result is ‘invalid’

      Reply

        atozcsdotnet

        October 17, 2015 at 1:06 pm

        see inside the case near simcard, at the back of battery,

        they claimed to use mobile uncle to manually write the imei back

        Reply

DEE

October 22, 2015 at 12:28 pm

hi..after download ROM Toolbox Lite, i got message Root Check Failed.. how to solve that.tq

Reply

    atozcsdotnet

    October 22, 2015 at 12:43 pm

    you hv to root the phone first before using rom toolbox lite

    Reply

      DEE

      October 22, 2015 at 2:01 pm

      boleh tunjukkan cara nak root?tq

      Reply

        atozcsdotnet

        October 22, 2015 at 3:55 pm

        download framaroot from google store

        Reply

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