wrong software/region

[Guest Dafs]

Hello every 1.
Device: Huawei G740
Problem: 
I have no signal on my device, no service at all. 
Can't call even emergency, and can't find any network manually.
I guess it's after I'w installed new firmware(stock), and ?maybe? it was wrong region. 

It wouldn't be a problem if I could install new rom from my region, but I can't, because my bootloader is locked.
Can't downgrade too.
And i can't find any newest rom for my region the same version I'w installed.

Ofcorse I can't get bootloader code from huawei support. And my recovery is still stock, phone rooted.
Maybe it's something about that csc, or maybe I don't need install new rom, just change something with radio.

Please help me:
if some1 know how to change region in situation like this, or get bootloader code, or get my region version.
Reading mutch about this, but can't find any sollution.

Sry long post, but if some1 can help I try to give as much info I can

All advices r welcome