Xperia C3 problem

[ShadowFax]

After granting root the whole screen turns black and after a reboot, none of the functions will work. Toast message repeatedly says f.lux is starting, lagging the phone until it stops responding.

[johndow2]

Can confirm exactly the same bug with Sony Xperia Z3 Compact (model D5803, processor Qualcomm, Android 5.1.1)