[HELP] S2 gt-i9100: No SIM,IMEI....and more. topic

First of all, thanks for your time. Here im going to try to explain my problem the best possible to try to find a solution without sending it to techincal service.

After reboot my device it stopped detecting SIM card, and the IMEI was null when typing *#06#. I never touched the android operating system even to update it, was the stock ROM. I entered this 'world' yesterday cause of need, so i might being telling you incoherent things, that and my english is bad, so sorry in advice.

Info about my device:

-Android Version: 2.3.5
-Kernel Version: 2.6.35.7-I9100XWKJ3-CL647431 root@DELL82#2
-Compilation Number: GINGERBREAD.BGKJ3
-Model Number: GT-I9100

What i have tried?:

-To root my device with this post:
http://forum.xda-developers.com/gala...2#post14283342.
Wanted to root to try to use GSII_Repair. Root worked but kept getting problem with GSII_Repair, the 3 steps: program kept telling me i needed to fix my BusyBox(Which is installed). Also wanted to try to flash with the oficial ROM 2.3.5 again but didnt find any link alive to download it.
- Factory data reset (Ended with worse situation, cause cant use google play or concnet to wifi)
-Tried with the 9 steps guide in this forum to recover the IMEI, but cant delete 'efs' folder cause 'the data system is only for reading', was using root explorer. (didnt check a lot in the comments cause no time)

Curious thing is my efs folder is there and i think it got all inside, i did a zip file (with root explorer) and saved it to my pc. All the apps im using on my device come from my pc cause i cant use wifi nor google play aka market.

I might be forgetting things, so i will try to update this post even if we find a solution. Thanks again for your time.