Not working: EM7455 in Panasonic Toughbook CF-53 MK4 on W10 20H2

IoT Modules MC/EM Series
1

Hello

I’ve been lurking this forum for about a week looking for solutions. I have a CF-53 which came with an EM7305 installed and has mostly worked fine, once I got my Windows installs to behave.

I recently purchased a used Lenovo EM7455 as I would prefer a CAT6 modem. Obviously, this didn’t work and I have spent many hours over the last week messing around with various Ubuntu bootables and terminal emulators but finally I managed to open the ports for COM and Modem, change the PID/VID and flash generic firmware. Everything looks good and I’ve been pleased to get this far…

…but it still shows “No Service” and cannot connect.

Could anyone please suggest what I should now try?

Many thanks in advance.

1

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2488×506 16.2 KB

2 
C:\Users\rory>netsh mbn show interfaces

There is 1 interface on the system:

    Name                   : Cellular 35
    Description            : Generic Mobile Broadband Adapter #35
    GUID                   : {6248E53E-F322-476F-B204-AE8E6EE8AA12}
    Physical Address       : 8c:9d:84:**:**:**
    Additional PDP Context : No (Physical interface)
    Parent Interface Guid  : No parent
    State                  : Not connected
    Device type            : This is a remote device
    Cellular class         : GSM
    Device Id              : 014************
    Manufacturer           : Sierra Wireless, Incorporated
    Model                  : EM7455
    Firmware Version       : SWI9X30C_02.33.03.00
    Provider Name          :
    Roaming                : Not roaming
    Signal                 : 0%
    RSSI / RSCP            : 0 (-113 dBm)
3

What is the return of following AT command?

Ati3
At!entercnd=“A710”
At!gstatus?
At!impref?

at!UIMS?
At+cpin?
At+cfun?
At+cgdcont?
AT!entercnd=“A710”
at!SELRAT?
AT!BAND?

4

Hello jyijyi

AT
OK
ATE
OK
Ati3
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
MEID: 01458200073373
IMEI: 014582000733734
IMEI SV: 20
FSN: LF614276370210
+GCAP: +CGSM


OK
At!entercnd=“A710”
ERROR
At!gstatus?
!GSTATUS:
Current Time:  243              Temperature: 32
Reset Counter: 1                Mode:        LOW POWER MODE


OK
At!impref?
!IMPREF:
 preferred fw version:    02.33.03.00
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.072_000
 preferred subpri index:  000
 current fw version:      02.33.03.00
 current carrier name:    GENERIC
 current config name:     GENERIC_002.072_000
 current subpri index:    000

OK
at!UIMS?
!UIMS: 0

OK
At+cpin?
+CPIN: READY

OK
At+cfun?
+CFUN: 0

OK
At+cgdcont?
+CGDCONT: 1,"IPV4V6","internet","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

OK
AT!entercnd=“A710”
ERROR
at!SELRAT?
!SELRAT: 00, Automatic


OK
AT!BAND?
Index, Name
00, All bands


OK

I’m unsure about the errors for At!entercnd=“A710” as I am definitely connecting to the modem port (COM13, currently using Putty in Windows).

I did just spot this in Device Manager > Modems> Events

Device USB\VID_1199&PID_9071&MI_03\6&38259163&0&0003 requires further installation.

What do you think?

5

That command works in uppercase.

At!entercnd=“A710”
ERROR
AT!ENTERCND="A710"
OK
6

How about the following

At+cfun=1
At!pcinfo?

7 

At+cfun=1
+CME ERROR: operation not supported
At!pcinfo?
State: Low Power Mode
LPM voters - Temp:0, Volt:0, User:0, W_DISABLE:0, IMSWITCH:0, BIOS:1, LWM2M:0, OMADM:0, FOTA:0
LPM persistence - None

OK
8

BIOS—Device kept in LPM by host (BIOS locking/FCC Auth feature)

You might see here

9

Hi, but in the thread you link to, W_DISABLE:1

My modem shows `W_DISABLE:0

10

In your AT command, it says BIOS:1

11

I see, thank you.

There is a setting in the Toughbook BIOS “SET WIRELESS WAN ID”, which is currently set to “15” for the old EM7305 card. I might try changing that.

12

Changing the WWAN ID in BIOS acheived nothing (other than moving COM ports around).

Back into Ubuntu and minicom…

AT!ENTERCND="A710"
AT!NVRESTORE=0
AT!RESET

…to restore the device to defaults.

Now in W10

C:\Users\rory>netsh mbn show interfaces

There is 1 interface on the system:

    Name                   : Cellular 35
    Description            : Generic Mobile Broadband Adapter #35
    GUID                   : {95257072-BE2F-46A8-85B4-0E911A1E20E1}
    Physical Address       : 8c:9d:84:**:**:**
    Additional PDP Context : No (Physical interface)
    Parent Interface Guid  : No parent
    State                  : Connected
    Device type            : This is a remote device
    Cellular class         : GSM
    Device Id              : 014************
    Manufacturer           : Sierra Wireless, Incorporated
    Model                  : EM7455
    Firmware Version       : SWI9X30C_02.30.03.00
    Provider Name          : EE
    Roaming                : Not roaming
    Signal                 : 25%
    RSSI / RSCP            : 8 (-97 dBm)

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

Not had a chance to test yet but it’s connected so that’s a result. Thanks for the tips jyijyi