[Q] LG G2 "Service Disabled" topic

Hello, I am a newbie, I need help as I rooted my Canadian model g2 D803 and flashed a custom Rom, ever since then data under settings has been greyed out and at lock screen it shows a message "Service Disabled" when I insert a SIM, it does nothing, also under settings baseband says unknown and imei as well is unknown tho I have the imei of the phone on the box, I recently flashed the latest STOCK firmware but that did not resolve this, please help