Xperia Z3 plus cant install software update

[Nyanjui]

I am not able to install the software update even though I can download it. Tried sound 7 times and every time I get the message "Can't install"

[Uliwooly]

@Nyanjui

Are you using XC?

Xperia Companion (XC)

Software Repair Guide

Alternatives on How to backup Xperias

[Nyanjui]

I have tried that too. Same result

[Uliwooly]

@Nyanjui

what if you factory reset the phone?