White start screen

[Jko1]

Hey guys and sony,
I've got a huge problem with my Sony xperia Z4 tablet.
It won't start anymore. During that white loading screen it hangs up an crashes, even a hard reset does not work.
Any ideas or help? Don't want to do a wipe to be honest due to the fact that there are some studys on I did not copy to pc jet...

Thanks and I appreciate every help

[Uliwooly]

You could try to remove the SD and SIM cards but you might have to repair it with XC

[ngaugu]

i have almost a similar problem. bought xperia z4 sgp 771  new 5th dec 2016 from aus. insert sim card and a 64 g sd card. on start up it shows experia loading... powered by android... white screen... then it says... " unfortunately system UI has stopped" 

this information keeps appearing and its right on top of the power off  placement. so its almost impossible to shut down. i don't have and operatrion manual as it did'nt come with one. can anyone help please. i'' appreciate it very much. amateur. write in simple terms, please.

[Koey]

Try repair with sony pc companion