8520 unlocking problems

Hi, I've bought a BB 8520 from T-Mobile and I've been sent to Asia from my job and staying here for a long time. I've recieved a MEP code to unlock it from T-Mobile, so I can use local providers with my phone. But, as soon as I enter code and hit enter button phone frozes. I tried to upgrade my OS to 5. But, it didn't help. Any solutions or any ideas what could it be?
Thanks .
Device info
Your carrier: T-Moible
Blackberry Curve 8520, OS 5
Apps and free space
Nothing installed, upgaded to new OS without applications.

Anyone?

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