We upgrade SR3 to SR5 and need to reconfigure phones manually before upgrading cause wireless was deactivated (just two 8821 in test).   To downgrade, same issue we need to reconfigure them manually before ;(

Thanks, exactly we were on testing the latest version 11.0(3)SR5 during a week and it's happening again... We have to downgrade to the 11.0(3)SR4 version apparently.

Hi to all, i've got the same problem. I upgrade the last firmware and it was better during a week. After exactly one week, this problem occurs again. The phone disables wireless itself and it's impossible to reactivate it.   EDIT: We all need to down...