i have blackberry curve 8520
since i upgraded my blackberry to 5.0.0.681 it always says invalid sim card and SOS thing at the cornet top of my mobile.
i tried downgrading and i downloaded the new OS version 5 from blackberry.com
and i pressed on loader.exe and it did the rest then when they finished i looked up at my blackberry still its invalid sim card and SOS
it was working very well before i did the upgrade please help me 
PS : when i did the upgrade i did it from desktop manager they said your mobile needs to be upgraded to this version so they did it and then thats what happened
Please Help Me
Blackberry Problem Help?
By admin Posted in: blackberry
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