Xperia Z1 update failed topic

Hi ya'll

I bought a Xperia Z1 second hand on eBay and found that even though its stock ROM and bootloader is locked - its rooted with some dodgy chinese superuser app. It is running 4.2.2 and keeps saying update available but it keeps failing when I try to install an OTA update that seems to be available.

1. Is it failing cause its rooted?
2. How do I unroot it so I will get the 4.3 OTA?

Thanks in advance.

:good: