Huawei E8372h - 153 modem unlock failure

[brasammie]

Hello, please I was trying to use DC-unlocker to unlock my E8372h-153 modem, but it keeps failing. I really need your help.
Below are the details of the modem:

Found Applications port COM9

Found modem : E8372
Model : Huawei AuthVer 4 modem (New)
IMEI : 866457022955244
Serial NR. : B7Z7S16419000183
Firmware : 21.321.01.00.429
Dashboard version : WEBUI_17.100.18.00.429_RE5
Web UI version : WEBUI_17.100.18.00.429_RE5
SIM Lock status : Locked (Card Lock)
Wrong codes entered : 2 (unlock attempts left : 8)

Check account status

User : brasammie
Credits left : 7

Activated features:

Software debugger

Unlock Huawei AuthVer 4 modem (New) (866457022955244) cost 7 cr

================================================== =================

Unlocking, please wait ...

AT command error

Error code 37

unlock failed !

[Valdemaras]

if you get error 37 then it means version of your modem not supported for unlock

If firmware version begins with 2x.3xx.<...> unlock not possible, no way to flash it either, no downgrade, no solution, no workaround from us.