EC25-EUX firmware

Does the EC25-EUX Support SouthKorea LGU+ VoLTE?
I can not eanble UAC mode.
The sim card can registered but can not make call.
Do I need upgrade frimware?
Would you please send me Firmware?
and also let me know how to upgrade it.

Quectel
EC25
Revision: EC25EUXGAR08A08M1G

+QMBNCFG: “List”,0,0,0,“ROW_Generic_3GPP”,0x0501081F,202101071
+QMBNCFG: “List”,1,0,0,“TW_Mobile_China_VoLTE”,0x0580FB81,202104162
+QMBNCFG: “List”,2,0,0,“Bouygues_France_VoLTE”,0x05800101,201905211
+QMBNCFG: “List”,3,0,0,“Telstra-Commercial_VoLTE”,0x0580079E,202105192
+QMBNCFG: “List”,4,0,0,“Reliance_OpnMkt”,0x05011B38,202003251
+QMBNCFG: “List”,5,0,0,“Commercial-Smartfren”,0x0501250A,202012291
+QMBNCFG: “List”,6,0,0,“VF_Germany_VoLTE”,0x0502041C,202106231
+QMBNCFG: “List”,7,0,0,“Commercial-DT”,0x05011F1C,202106171
+QMBNCFG: “List”,8,0,0,“STC_Saudi_VoLTE”,0x0501FE01,201912231
+QMBNCFG: “List”,9,0,0,“TF_Spain_VoLTE”,0x05010CFA,202106171

OK

+QCFG: “ims”,1,0

this is not support volte?

yes, The command output is not supported

does this modem do not support volte or?
can i use volte by update firmware?