Help!: Galaxy S2-I9100 - Baseband/IMEI/SN/Airplane-Mode - Galaxy S II Q&A, Help & Troubleshooting

I have a S2 phone, out of warranty was bought from Spain under the Vodafone carrier. So is not stolen/imei blacklisted or other stuff i saw around.
Was bought by a good friend of mine, now he upgraded to S3 and his old S2 went to me, i think it was rooted, had superuser and acces to /efs/.nv_data.bin. to copy them from /device to /sdcard and also had busybox installed.
Phone shows even the airplane (with ariplane mode off) or the circle with the / inside and IMEI pops with " null/null ".
I did try GSII_repair and unlock software while i had the 4.1.2 software instaled as it came (from my friend) but no use.
I did try to get the nv_data.bin file with a hexedit and search for the 181468 (if i'm not wrong) line for the FF 01 00 00 00 stuff and change the 01 to 00, ofc nothing found about that line. Also between the .bak and .bin file since i remember was no difference at all.
I did try another method to search in the nv_data.bin for the SGH thing about the serial number, again without finding anything.
I tought a stock ROM will help, so i found a tutorial and with Odin3 v1.85 i've put this rom GT-I9100_XEU_I9100XWLP7_I9100XXLPS_I9100XEULP5.tar.md5 with the pda button. Of course the phone turn on and freeze on the S2 logo, than went on MENU+VOL Up+power, and did a whipe and turned on the phone. This went to 4.0.2 with :
Build nr.: IML74k.XWLP7
PDA: I9100XWLP7
CSC: I9100XEULP5
kernel
3.0.15-I9100XWLP7-CL340913
[email protected] #3
Again *#06# and babam, IMEI nothing there.
So i did upgrade again to 4.1.2 I9100XWLSE_I9100OXELS6_I9100XXLS8_HOME.tar.md5 with oding on the pda tab and now shows:
Build nr.: JZ054K.I9100XWLSE
kernel
3.0.31-889555
[email protected] #3
SMP PREEMPT KST 2013.
PDA:I9100XWLSE
CSC:I9100XELS6
Baseband unknown, Imei unknown but now shows something for SN, this: SN: 00195ef068dfae.
Also found some codes *#7465625# -wich shows nothing and than when i try to enter service menu for debung and stuff also shows nothing.
So found another tutorial to add 3 files in Odin, the PDA option (that i used 2 times) and the PHONE and CSC options with 2 more files to upload. I will download, try and post back.
Thanks in advance for any1 wich reads/reply/helps or talks on this theard.:good:
p.s. I tried a soft called SRS with 3 free options to change null imei to 0004999 or something and it tells that phone is not rooted in this moment, and he might be right and here cames the qestion, while you change ROM you lose the root and su because if not, than means phone was not rooted, but hard to think at that because i could acces the /efs folder. Complete mind**** here....
edit: i did try that rom 4.1.2 with I9100XXLSJ_I9100OXXLS1_OXX with the 3 files below
pda: CODE_I9100XXLSJ
csc: CSC_HOME_OXX_I9100OXXLS1
modem: MODEM_I9100XXLS6 Still no baseband/imei and yeah for sure phone is not rooted now, should i root the phone and than .... try what? throw it on window / use it as ipod device ?
edit: found what is suppoused to be my original fimware Latest firmware from Spain / Vodafone carrier (ATL)... i will try to flash it with odin and see what happens.
GT-I9100 Galaxy S II
PDA: I9100XWLSD
CSC: I9100ATLLSC
MODEM: I9100BULS1
Added: 2013-02-04

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You do that.
You're looking for a EFS folder back up, check out ktool to see if you can recover the IMEI.
Also call your friend and ask him how the IMEI got lost and if he backed up the EFS folder at any point.
Sent from the little guy

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gastonw said:
You do that.
You're looking for a EFS folder back up, check out ktool to see if you can recover the IMEI.
Also call your friend and ask him how the IMEI got lost and if he backed up the EFS folder at any point.
Sent from the little guy
Click to expand...
Click to collapse
Thanks for your answer and support.
1. This stupid problem came out of nowhere and he did not had a backup on anything.
2. Found out the device was not rooted when that happen (4 days ago) and his bigger brother tryed to use suroot and some tools like ktool or something and another useless tool, and that was the moment when he created the backups.
3. So backups were created after, phone was not rooted when it happen, no backups at all. Now i've put the 4.1.2 baseband, rooted the device, installed jeebo kernel, did try some Dalkvin wipe from cwm but still no result, when i got the phone had no serial number at all, and i don't know how i managed by swamping from rom to rom to get a SN like 00195ef068dfae, this is not the SN but make me feel better than a empty SN field.
I guess that Z3X box would do miracles, but in my city (Brasov, Romania) no1 has one at workshops, found one for about 120$ but at around 100$ i can get a MB to swamp...but still i can not afford that at the moment...
Did try Ktool/gsII_repair and efs repair (chinese verison smthing) without any result like the 3rd time but now with my own root and cwm and stuff. This is another backup made with ktool 5mins ago http://dl.xda-developers.com/attach...5454/2/1/3/5/1/7/5/EFS_Backup_with_K-tool.zip
Also managed to use EFS pro, did a backup, tried to repair baseband/format efs... nothing works
When i try now to repair emai /baseband-again, show an error about mounting /efs
---------- Hardware Information ----------
Connected Device SN.: 00195ef068dfae
Device Manufacturer: SAMSUNG
Device Model: GT-I9100
Product Code: Unknown
Hardware Version: Unknown
---------- Firmware Information ----------
PDA Version: I9100XWLSD
Baseband Version: Unknown
CSC Version: I9100ATLLSC
---------- Software Information ----------
Kernel Release: 3.0.31-Jeboo_Kernel_v1.2a+
Kernel Version: #26 SMP PREEMPT Mon Jan 28 22:48:56 EST 2013
ROM Build: GT-I9100-user 4.1.2 JZO54K I9100XWLSD release-keys
Android Version: 4.1.2
BusyBox Version: 1.20.2-jb
SU Binary Version: 0.97:SUPERSU