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[Q] SIM NETWORK UNLOCK PROBLEM AFTER update and rooting lost

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Default [Q] SIM NETWORK UNLOCK PROBLEM AFTER update and rooting lost

Hello Good Technical Supporters and helpers .
I rooted my Samsung Galaxy S2 GT I9100 and Upgraded it to Slim bean Android 4.3.1 . But Upon restarting my phone, it requires me to out a SIM network unlock PIN, I will tried 0000,12345, which are some universal codes but to no avail , Im stocked and dont know what to do , My phone only gives me the option to Unlock or dismiss , i thought It was my SIM error so I out my SIM in another phone ad it required no password at all. I then realized i was the phone. Can someone help me out please,
I even install Galax SIM unlock but still it say my ROM is not rooted , SO please is there anything I can go to unlock this phone. I even tried rooting again but still the same issue. Please Please Please Help.
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