[cmr]

Hi!

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!

[cmr]

If i restore my bb9900 from before it was upgraded , shouldnt that work?