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[andi2015si]

i have bought my galaxy s4 Mt6589 and i thought maybe there is an update for it but i don't know if i'm right or wrong. I have some problems with this phone : Camera doesnt function since the phone was open, youtube doesnt function, gps doesnt function. Can anyone tell me what to do?? Any reflash, root or what else to fix this problem??
The info for my phone is

Model number:
GT-I9500

Android Version:
4.2.2

Baseband Version:
I9500XXUAMDK

Kernel Version:
3.4.5-526212
se.infra@SEP-111 # 1
Tue Apr 23 23:00:57 KST 2013

Build Number:
JDQ39.I9500XXUAMDK

SELinux status:
Permissive

so my questions are:
what does it mean AP, CP, CSC?
is there an update for my S4 and if it's a yes how do i update ?

thanks