After update samsung sm-a5000 5.0.2 showing no signal

Dear supporter i just update samsung SM-A5000 on OTA 5.0.2,,,,but after updating ,,,showing NO SVC ( EMERGENCE CALL ONL ) then i download file and again reflash it b ODIN ,,,,but still same problem ,,,i just wanna to know -:

1 Is their any solution to fix signals ?

2 Is it possible to downgrade this set from 5.0.2 to 4.4.4 means from lolipop to kitkat?