EM7455 "System mode: Unknown" Issue

How do I recover the EM7455 modem from “Unknown” system mode state.

AT!GSTATUS?
!GSTATUS:
Current Time: 14401 Temperature: 39
Reset Counter: 2 Mode: ONLINE
System mode: Unknown PS state: Not attached

OK

AT+COPS?
+COPS: 0

AT+COPS=?
ERROR
AT+COPS=?
+CME ERROR: operation not allowed

AT!GETBAND?
!GETBAND: No Service

OK

AT!PCINFO?
State: Online
LPM voters - Temp:0, Volt:0, User:0, W_DISABLE:0, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0
LPM persistence - None

OK

ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09
MEID: A000005368D949
ESN: 12807986565, 8079DD85
IMEI: 359073065280905
IMEI SV: 12
FSN: LF942404500210
+GCAP: +CGSM

OK

AT!GCDUMP
No crash data available

OK

AT!IMAGE?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
FW 1 GOOD 22 0 0 ?? 02.24.05.06?
FW 2 GOOD 17 0 0 ?? 02.24.03.00?
FW 3 GOOD 21 0 0 ?? 02.33.03.00?
FW 4 GOOD 19 0 0 ?? 02.32.11.00?
Max FW images: 4
Active FW image is at slot 1

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
PRI FF GOOD 0 0 0 002.027_000 02.24.05.06_ATT
PRI FF GOOD 0 0 0 002.026_000 02.24.05.06_GENERIC
PRI FF GOOD 0 0 0 002.022_000 02.24.03.00_SPRINT
PRI FF GOOD 0 0 0 001.000_000 00.00.00.00_OEMPRI918
PRI FF GOOD 0 0 0 002.034_000 02.24.05.06_VERIZON
Max PRI images: 50

OK

AT!IMPREF?
!IMPREF:
preferred fw version: 02.24.05.06
preferred carrier name: VERIZON
preferred config name: VERIZON_002.034_000
current fw version: 02.24.05.06
current carrier name: VERIZON
current config name: VERIZON_002.034_000

OK

AT!PRIID?
PRI Part Number: 9907469
Revision: 001.000
Customer: Generic-M2M

Carrier PRI: 9999999_9904594_SWI9X30C_02.24.05.06_00_ATT_002.027_000
Carrier PRI: 9999999_9904609_SWI9X30C_02.24.05.06_00_GENERIC_002.026_000
Carrier PRI: 9999999_9904779_SWI9X30C_02.24.03.00_00_SPRINT_002.022_000
Carrier PRI: INTERNAL_9901234_EM7455_00.00.00.00_00_OEMPRI918_001.000_000
Carrier PRI: 9999999_9904780_SWI9X30C_02.24.05.06_00_VERIZON_002.034_000

OK
AT!BAND?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
09, LTE ALL, 0000000000000000 000000000000101A 0000000000000000

Hi @akn

You are not in the latest firmware, please download the latest firmware(SWI9X30C_02.33.03.00) and retry.
You can get it at here:
https://source.sierrawireless.com/resources/airprime/minicard/74xx/airprime-em_mc74xx-approved-fw-packages/#sthash.FTfL7zc0.dpbs
If it still cannot register to the network, please share me the log file with the following commands.

AT!ENTERCND="A710"
AT!BAND?
AT+CGDCONT?
AT!GSTATUS?
AT!IMPREF?

Registration is still failing even with the latest Verizon firmware.
How do I recover from this state without rebooting my host device?

AT!ENTERCND="A710"
OK
AT!BAND?
Index, Name,                        GW Band Mask     L Band Mask      TDS Band Mask
09, LTE ALL,                        0000000000000000 000000000000101A 0000000000000000


OK
AT+CGDCONT?
+CGDCONT: 1,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IP","vzadmin","0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 4,"IPV4V6","vzwapp","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 5,"IPV4V6","vzw800","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 6,"IPV4V6","vzwclass6","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

OK
AT!GSTATUS?
!GSTATUS:
Current Time:  256              Temperature: 39
Reset Counter: 6                Mode:        ONLINE
System mode:   LTE              PS state:    Not attached
LTE band:      B4               LTE bw:      20 MHz
LTE Rx chan:   2300             LTE Tx chan: 4294967295
LTE CA state:  NOT ASSIGNED
EMM state:     Deregistered     Limited Service
RRC state:     RRC Idle
IMS reg state: No Srv           IMS mode:    Normal

PCC RxM RSSI:  -78              RSRP (dBm):  -120
PCC RxD RSSI:  -78              RSRP (dBm):  -121
Tx Power:      --               TAC:         3174 (12660)
RSRQ (dB):     -20.0            Cell ID:     0140680A (20998154)
SINR (dB):     -8.6


OK
AT!IMPREF?
!IMPREF:
 preferred fw version:    02.33.03.00
 preferred carrier name:  VERIZON
 preferred config name:   VERIZON_002.079_001
 preferred subpri index:  000
 current fw version:      02.33.03.00
 current carrier name:    VERIZON
 current config name:     VERIZON_002.079_001
 current subpri index:    000

OK

Hi @akn

I see your EM7455 registered network successfully on previous tickets.


Do you use the same Verizon SIM?

I am using 2 SIMs. One with dynamic and one with static IP.

“System mode: Unknown” issue was seen with both of these SIMs.

I was unable to resolve even after modem reset.

Registration was successful only after host system reboot.

Please ignore RRC related query as it was seen on different setup and now I don’t have access to it.

Hi @akn

The issue is solved. Please help to tick “Solution”.

1 Like

Yes, rebooting the host system resolved this issue.

Can I avoid host system reboot and recover from this error?

Hi @akn,

The host system may have a problem, so you need to restart it.