AnonD-194570, 10 Apr 2014Try factory resetI tried everything: factory reset, clearing cache, deleting apps, formatting memory. I even went to a Sony authorized repairer and even they can't fix it (can't downgrade due to locked bootloader). My friends z1 compact is also having this issue.
After this update my xperia z1 now lags like hell and the screen flickers when I use resource intensive apps. To all Xperia Z-series users out there: DO NOT UPDATE.