y336-u02 emergency calls

i have 40 pcs y336-u02 have problem with network
all new phones have imie ok but no calls
i flashed many pcs with this firmware Y336-U02V100R001C390B111
and try to eras phone and flash again
i try to repair imie
i try to sp unlock
i try to write nv file from anther working phone
but nothing change
imie is ok but always emergency calls only – no sim card

phone not accept downgrade firmwares

how i can solve this problem
im sure that phones not hardware problem
its all new phones came from Dubai but phones boxes and back lables writen by Russian language