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Old 06-08-2012, 04:39 AM   #1 (permalink)
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Join Date: Jun 2012
Model: 9900
Carrier: tele2 comviq
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Default Downgrade from os 7.1 to os 7 blackberry 9900???

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how do i downgrade my bb9900 from os 7.1 to 7.0. I bought a 3500mh battery and it doesnt work with the latest OS. My BB is unlocked and my carrirer is Tele2 comviq (its a Swedish carrier).
I tried to downgrade the OS from the phonemeny but i dont have the "downgrade" button in "options, device".

Need help plz!
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