A week ago my Z1 was updated to Android 5.1.1 yesterday suddenly and while charging it using car charger it went completely dead and no power on after several unsuccessful tries of pressing combination of keys their was no response, in one of the posts I read that it may be useful to put it charging for a time I did that and what it gave me is red led light and after almost two hours of charging the red light was gone I tried switching it on and this time my phone responded, I made factory reset but still two problems the phone stops charging at 96 % and does not continue the other problem when trying to switch it of it keeps giving aflashing screen with Sony logo and to shut it down I must press power key and volume key together!!!!!!
I am very disappointed with Z1.
Please note that I have T2 ultra and was updated a to the same android version without any problems