Error 37 when unlocking

[chipanta]

Im trying to unlock modem with DC Unlocker software and i keep getting error 37

Detecting modem :

selection :
manufacturer - Huawei modems
model - Auto detect (recommended)

Found Applications port COM19

Found modem : E5573s-856
Model : Huawei AuthVer 4 modem (New)
IMEI : 863294037907032
Serial NR. : TBCDU17928001720
Firmware : 21.328.62.00.1439
Dashboard version : WEBUI_17.100.18.01.1439_MRE5
Web UI version : WEBUI_17.100.18.01.1439_MRE5
SIM Lock status : Locked (Card Lock)
Wrong codes entered : 5 (unlock attempts left : 5)

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

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.