[Q] Galaxy S2 GT-I9100 sim card and imei problem - Galaxy S II Q&A, Help & Troubleshooting

hello , sorry for my english. i have one s2 and dont recognize my sim card (is not locked) and when i press *#06# say imei null/null
i try everything with odin but nothing. PLS someone help me

Did you Bk up efs

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Guys pls help me.
I have installed rom on this device. Rom was great.
The only one problem is that my sim card not working.
I typed *#06# but there isn't any imei number.
I think that i deleted that imei file.
On the back side of my phone, under battery i can see imei code. But system can;t reconize it.
If u can help me to fix this problem.
(sry for my bad english)

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HELP

I Accdidently ticked the clear EFS in odin. Now my phone does not recognize the sim card. The IMEI number ia null and the baseband is also unknown. ??
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