why can't I upgrade the new OS 5 ON MY BLACKBERRY 8900 CURVE?

choco123

New member
when i go on options > wireless update
it says there are no updates available
even on my desktop software it says I am currently on OS 4 but there are no updates available.
when I downloaded the OS 5 onto my desktop it still says there are no updates.
please can someone help, I'm really frustrated.
 
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