EM9191(linux/aarch64) not conncecting to 5G nr->not attached

Hi, there,
We are currently working on EM9191 to connect to 5G network.
We did succeeded once by using the cmd provided in readme of ehe driver src folder

$ mbimcli -d /dev/mhi_0306_00.01.00_pipe_12 -p --set-radio-state=on;
$ mbim-network --profile=/etc/mbim-network.conf.au /dev/mhi_0306_00.01.00_pipe_12 start;
$ mbimcli -d /dev/mhi_0306_00.01.00_pipe_12 -v -p --query-ip-configuration
and set the network with the information shown.

But since then, we could not connect to 5G again.
Did a little bit research of the AT command.

Here is the information that might be useful.
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM9191
Revision: SWIX55C_02.08.01.00 58f60e jenkins 2021/03/12 18:05:48
IMEI: 355890340501662
IMEI SV: 4
FSN: 8W1347524502A1
+GCAP: +CGSM

ATI8
Manufacturer: Sierra Wireless, Incorporated
Model: EM9191
Revision: SWIX55C_02.08.01.00 58f60e jenkins 2021/03/12 18:05:48
IMEI: 355890340501662
IMEI SV: 4
FSN: 8W1347524502A1
+GCAP: +CGSM

AT!BAND?
Index, Name
0C, NR5G ALL

AT!SELRAT?
!SELRAT: 00, Automatic

AT+CGDCONT?
+CGDCONT: 1,“IP”,“uad5gn.au-net.ne.jp”,“0.0.0.0”,0,0,0,0,"",0
+CGDCONT: 2,“IP”,“uad5gn.au-net.ne.jp”,“0.0.0.0”,0,0,0,0,"",0

AT+COPS=?
+COPS: (1,“KDDI”,“KDDI”,“44051”,7),(3,“SoftBank”,“SoftBank”,“44020”,7),(1,“999 001”,“999 001”,“999001”,7),(1,“440 52”,")

I don’t undestand why the PS state: is like always Not attached ?
And the NR5G band is “No band”?
Does it mean the module cannot detect the 5G band?

AT!GSTATUS?
!GSTATUS:
Current Time: 722 Temperature: 33
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 4 Mode: ONLINE
System mode: NR5G PS state: Not attached
IMS reg state: NOT REGISTERED IMS mode: Normal
IMS Srv State: UNKNOWN SMS,UNKNOWN VoIP
NR Tx Power: – TAC: 004088
Cell ID: 288
NR5G band: No band Carrier Index: 0
NR5G dl bw: 5 MHz NR5G ul bw: Unknown
NR5G Rx chan: 159600 NR5G Tx chan: 0
NR5G dl MIMO: 0 NR5G ul MIMO: 1
NR5G(mmw) Rx0 RSSI (dBm): — NR5G(mmw) Rx1 RSSI (dBm): —
NR5G RSRP (dBm): — NR5G RSRQ (dB): —
NR5G SINR (dB): —


BTW, the same sim card is also inserted into a iPhone and it is immediately recognized and 5G connected.

Please kindly help and thank you for your help in advance.
Best,

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