help gt-i9500

i have 9500
it was android 5.0.1
i flashed it 4.2.2
i found problem with network
what to do?
reading info
Platform: Samsung Android
Selected port: COM1
Selected model: GT-I9500
Reading info, please wait…
Detected phone model: GT-I9500
Firmware compiled date: Tue Apr 23 23:08:00 KST 2013
PDA version: I9500XXUAMDK
CSC version: I9500OJVAMDK
SW version: I9500XXUAMDK
Phone IMEI: 004999010640000
Phone SN: RF1D97QT8VE
Android version: 4.2.2 (JDQ39)

plz help