Why won't my Galaxy S4 update to 5.0?

A

AC Question

Galaxy S4 won't update to 5.0

I've been trying to update my S4. It has been rooted but I unrooted it using SuperSu. I rooted again and changed the device status to official, so that I can download the update. The update showed and was downloaded but when it went to the installation process it was rebooted and when it comes to 26% it says "Error" and reboots without updateing. I dont know what to do. Pls help.thanks