my sony z1 c6903 No sim card and no Service

Hello guy,
My sony z1 no sim card and no service, what a problem? I put sim card on other phone its can detect and have service..but my phone cant detect sim card..its a ic sim problem or waht? Please who have face this problem help me :(

How do i update my rooted c6903 running 5.0.2 to 5.1.1?

What would be the easiest way to do it without deleting all my apps and data?

Also i'm currently running superuser and xposed on it.