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I flashed my rooted i9300 to go from stock to CM 11. I used TWRP twrp-2.8.6.0-i9300 to flash it. Previously, I did a nandroid backup using CWM but since CWM had problems with flashing GApps, I had to switch to TWRP.

Flash successful. GApps successful. However, I have:

  1. "No Service" problem
  2. "Baseband Unknown" in the "About device" section
  3. I have a non-blank /efs folder. I read that a lot of times people have issues because the folder is empty after flashing.

Having gone over this XDA HOW-TO, I am guessing that I need to flash a modem for my particular phone. I even managed to locate a collection of modems on XDA.

But a couple of questions remain:

  1. What modem do I flash? My stock was 4.2 bought in Saudi Arabia so I am guessing I will need a corresponding modem? but I have moved to India so what modem do I use? I believe the modem suffixes like JV, etc. have importance?
  2. How do I flash that modem?
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Official CM uses open source RILs so these Samsung RILs won't be compatible.

Galaxy S3 RIL + Modem CWM Flashable Collection

i can't test this one, but you can.

and also, read :

  • Do not flash these zips on leaked Android 4.2 Samsung ROMs unless you delete the System folder inside the zip using a tool such as WinRAR. Otherwise you will end up with no signal and you may have to re flash your ROM to get the 4.2 RILs back.
  • XXEMG4 and later Modems will modify your efs partition(where your phone IMEI info is) making older modems incompatible with your phone. In order to use older modems again you must restore an old backup of your efs partition. So make sure to backup your efs partition before you do anything.

This is for india : - DDEMB1

Android : 4.1.2 Date: 20/02/2013 Carrier-Country-Region: Unbranded - India, Sri Lanka, Nepal - South Asia RIL MD5: 788BBF58812206981E4465966BA45BBD

Download : Mediafire

and as i said, if you have an backup, goto Recovery -> Install from Zip and install latest EFS From last rom.

P.S : Try to flash stock rom.if this problem exist Yet, you need z3x Box for baseband and fix this.

hope this helps.

| improve this answer | |
  • Don't I need JKEMC1 Android:4.1.2 Carrier-Country Region: Unbranded - Israel - Middle East ? – An SO User Mar 29 '15 at 8:48
  • you need for india right ? So, in your comment, this is for Middle East – ʍѳђઽ૯ท Mar 29 '15 at 8:51
  • That's the problem. The phone was bought in Middle East and now I am in India :-P – An SO User Mar 29 '15 at 8:53
  • as i know, if efs doesnt work with these, you need Z3X box and inconvenience you with this phone :) – ʍѳђઽ૯ท Mar 29 '15 at 8:55
  • That's right.Option like: In TWRP -> Backup -> Backup from Modem or Efs. – ʍѳђઽ૯ท Mar 29 '15 at 9:01

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