And how can i downgrade to .358
or .668 if something goes wrong?
Sent from a old but beautiful BB 8520 or a new and shinny PB 2.0
Back up your device.
Connect your PB to your PC and run the DM.
reset(three finger salute or cycle power) the device while it is still attached to the PC and it will ask if you want to recover. Say yes, and about 1 - 1.5 hours later (depends on download speed) you should be good to go.