Huawei E5770s please help with unlock


I have a Huawei E5770

Found modem : E5770S
Model : _Unknown Huawei modem_
IMEI : 86747202011xxxx
Serial NR. : UCDDU15B18000207
Firmware :
Dashboard version : WEBUI_17.
Web UI version : WEBUI_17.

its locked to o2

i tried to unlock it using method that works on
Huawei E5573s-320

Huawei E8372h

Huawei E5573s-606

Huawei E3372h

that i found on this forum but it wont let me to read the hash keys

I used "Huawei Code reader" , "Dc-Unlocker" and "Putty"

when i enter this command AT^NVRDEX=50503,0,128 on putty or dc unlocker it just says "error"

can anyone calculate v4 code just by imei? :confused:

I already tried the v3 code but it didn’t work 😡

can anyone help me with unlock or guide me where to get unlock code from?

many thanks