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Help SIM card works only after a reboot after 2.3.5 upgrade

Hey guys,

Basically, I flashed my phone to gingerbread 2.3.5. I'm pretty sure my phone was locked to my provider because I could see the provider's name whenever I was booting the phone.

Now, the problem is that the phone recognizes my SIM card only whenever I reboot the phone and sometimes I can't even make calls even if I rebooted. I tried to reinstall 2.3.4 from an online version but I still have the same problem.

Is there a way I can downgrade to the version I had when I bought the phone? It was 2.3.4 but I assume it was my provider's version though. If there's no way I can do that, I'm just gonna go ask my provider tomorrow.

Thank you.
 
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