EM7750s are "Turned Off" every reboot ever since 1903

IoT Modules MC/EM Series
22

does anyone knows if this issue has been addressed since 2020? this is March 2023 and still I am struggling to find a solution

23

I’m having this issue with the EM7421 module. there must be a fix somewhere by now?

24

Hi @tim.strange,

What issue are you currently experiencing? Please provide more detailed description.

Thanks,

25

When we boot into Windows the Cellular network is off, turning it to airplane mode and off enables the Cellular network.

26

Hi @tim.strange,

  1. What firmware is EM7421 currently running? If it’s not the latest version, please download and install it from the following link: https://source.sierrawireless.com/resources/airprime/minicard/74xx/em_mc74x1-approved-fw-packages/#sthash.2NYexTSP.dpbs
  2. If possible, please share a screenshot of the “Cellular network is off” status.
  3. Could you please share the output of the following commands with me?
ATI9
AT!IMPREF?
AT!GSTATUS?
AT!ENTERCND=<“key"> (default is AT!ENTERCND=“A710”)
AT!BAND?
AT+CGDCONT?
AT+COPS?
AT+CREG?
AT!USBCOMP?

Thanks,

27

I am currently also experiencing other issues with connecting to the network, which is not being helped by the cellular card being switched off.
Here is how it initially looks after a hard shutdown

Cellular network is off
Cellular network is off688×618 47.1 KB

OK
ATI9
Manufacturer: Sierra Wireless, Incorporated
Model: EM7421
Revision: SWI9X50C_01.14.13.00 883709 jenkins 2022/01/05 07:08:35
IMEI: 356281110569445
IMEI SV: 14
FSN: 8G2496212804B1
+GCAP: +CGSM

OK
AT!IMPREF?
!IMPREF:
preferred fw version: 01.14.13.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.048_000
preferred subpri index: 000
current fw version: 01.14.13.00
current carrier name: GENERIC
current config name: GENERIC_002.048_000
current subpri index: 000

OK
AT!GSTATUS?
!GSTATUS:
Current Time: 466 Temperature: 30
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1600 LTE Tx chan: 19600
LTE SCC1 state:NOT ASSIGNED
LTE SCC2 state:NOT ASSIGNED
LTE SCC3 state:NOT ASSIGNED
LTE SCC4 state:NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Idle
IMS reg state: No Srv

PCC RxM RSSI: -82 PCC RxM RSRP: -113
PCC RxD RSSI: -93 PCC RxD RSRP: -134
Tx Power: – TAC: 1005 (4101)
RSRQ (dB): -10.9 Cell ID: 0004f77b (325499)
SINR (dB): 0.6

OK
AT!ENTERCND=“A710”
OK
AT!BAND?
Index, Name, GW Band Mask L Band Mask 1 TDS Band Mask L Band Mask 2 L Band Mask 3 L Band Mask 4
00, All bands 0002000004400000 000007A0880800C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000

OK
AT+CGDCONT?
+CGDCONT: 1,“IP”,“wapaccess.co.nz”,“0.0.0.0”,0,0,0,0
+CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK
AT+COPS?
+COPS: 0,0,“Skinny”,7

OK
AT+CREG?
+CREG: 0,1

OK

AT!USBCOMP?
Config Index: 1
Config Type: 3 (Generic)
Interface bitmask: 0000010D (diag,nmea,modem,rmnet0)

OK

28

Hi @tim.strange,

Please switch to MBIM mode by entering the following commands:
AT!ENTERCND=“A710”
AT!USBCOMP=1,1,100D
AT!RESET

Then, close and reopen Skylight to see if the turn-off state persists.

Thanks,

29

Please switch to MBIM mode by entering the following commands:
AT!ENTERCND=“A710”
AT!USBCOMP=1,1,100D
AT!RESET

Well that was interesting!
I’ve lost the cellular button altogether, the driver don’t seem to recognize part of the card, reinstalling the drivers doesn’t help. and Skylight doesn’t detect a card anymore.

image
image
image

30

so, I’ve reimaged the computer and it almost works,

This fresh image works, in that windows detects and uses the APN from the Sim card, skylight is now letting me set profiles and it event connects to the internet (it wasn’t doing this previously). And windows does not need the flight mode cycled to enable cellular.

But…

there are three devices labelled “Sierra Wireless EM7421 Qualcomm Snapdragon X16 LTE-A” under the “other devices” with no driver.
If I install the driver, “GenericDriverSetup_5087” the cellular network disappears.

so, my question is, is there a different driver set for MBIM mode?

31

Hi @tim.strange,

Please refer to the information about Windows Drivers for EM/MC Series Modules at the following link: https://source.sierrawireless.com/resources/airprime/software/airprime-em_mc-series-windows-drivers-qmi-build-latest-release/#sthash.wGlkFQ5c.dpbs

Thanks,