No service/ wrong region?

Device: Huawei G740
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.

Please help me:
how 2 change region in situation like this, or get bootloader code, or get my region version.
Or maybe it's another problem

more info
------------this is info from dc unlocker
Serial NR. : G8V0214718001**** (same as on my phone's back)
Firmware : M8930V100R001C00B165_AMSS May 21 201421:14:09

----------my phone settings>about shows other information
Serial- other 1
and version G740-L00V100R001C432B178 (it's WEEU version I guess, I live in EEU)

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