Default [Q] PLEASE help. SIM card problem!

I am using 4.1.x ROMs for my phone "Micromax A110" and both SIM cards function fine but when I install 4.2.x ROMs only one works and the other remains on "No mobile Network". Others don't have this problem on their phone but why in mine? Help.
Device: Samsung Galaxy SIII GT-I9300
ROM: Stock Rooted
Android Version: Jelly Bean 4.3
Kernel: Boeffla Kernel 5.3