Default [Q] Please help. Need to downgrade

I upgraded my note to 4.4.2 with freeza rom. I have my phone flashed to a different service provider (other then sprint) I found out that 4.4.2 is not compatible with the flash. Anytime my device is flashed then my phone has no service. It has a red x on the service bars. If I can downgrade my phone then I will regain service and be able to use my device. If I can't downgrade then you can say I just have a paper weight.