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Reinstall 5.1.1 with PCC and report back in couple of days
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Reinstall 5.1.1 with PCC > report back in 2 days.
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
You should try my suggestion.
if you want to downgrade you have 2 options
contact your local Xperia care
http://support.sonymobile.com/global-en/contactUs/
or
use flashtool
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459