BG77 : LwM2M work in V1.0 but no in V1.1

Hello,
I work with a BG770A-GL and I want to used the LWM2M.
In LwM2M V1.0 I connect to the server successfully but not with V1.1 (using command AT+QLWCFG=“version”)
BG77 version = BG770AGLAAR01A03

Log V1.0
AT+QLWCFG=“version”,0
OK
AT+QCFG=“lwm2m”,1
OK
AT+QLWCFG=“security”,0,100,“”,0,0,“”,“”
OK
AT+QLWCFG=“server”,0,600,0,50,60,1,“UQ”
OK
AT+QLWSVC=“reg”
OK
+QLWREG: 0
+QLWURC: “event”,100,0,“INITIAL”
+QLWURC: “event”,100,2,“REG_READY”

Log V1.1
AT+QLWCFG=“version”,1
OK
AT+QCFG=“lwm2m”,1
OK
AT+QLWCFG=“security”,0,100,“”,0,0,“”,“”
OK
AT+QLWCFG=“server”,0,600,0,50,60,1,“UQ”
OK
AT+QLWSVC=“reg”
OK
+QLWREG: 0
+QLWURC: “event”,100,0,“INITIAL”
+QLWURC: “event”,100,3,“REG_FAILED”
+QLWURC: “event”,100,12,“REG_RETRY”
+QLWURC: “event”,100,3,“REG_FAILED”

Can I solve this problem ?

I work with the document : BG95&BG77&BG600L Series
LwM2M Application Note

Hi @Corentin_Olhn

Could you please share the detailed version with AT+QGMR command? probably the old version do not support version 1.1