Question [Q] [SIM Card] How to fix SIM card error !

I've got LG Optimus T P509 and Gingerbread 2.3.6 !
And when I installed it i found that mobile couldn't read SIM card
Please help I need gingerbread 2.3.6 because some apps didn't work on Froyo 2.2.2 and Cyanogen 7-9-10 .etc and it worked on gingerbread 2.3.6
And Mass storage don't work :3 !
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