We are having issues getting our Sierra Wireless EM9291 modem connected to the network. It seems to be stuck in “Registration state: ‘not-registered-searching’”, and we have not found any way to get it to actually register to a network. Some output: response: '!GSTATUS: Current Time: 4210 Tempe…

Did you enter correct APN? How about setting to LTE only mode by at!selrat?

My APN is correct: response: ‘+CGDCONT: 1,“IP”,“MY-APN”,“0.0.0.0”,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,“”,0’ However, SELRAT is behaving strangely, when I set SELRAT to 06 (which I believe is LTE only) and I try to follow the steps to register it reads…

how about using AT!BAND to set to LTE only? Do you see any problem in Windows platform?

How do I change AT!BAND and start a new registration process? I’m getting errors when trying to change AT!BAND now, so if you could share a specific sequence of commands I could try that would be very much appreciated, and minimize the odds of me doing something wrong on my side.

what do you see for the followings? AT!ENTERCND="A710" ati3 at!impref? at!BAND=?

ati3 NO CARRIER ATI3 response: 'Manufacturer: Sierra Wireless, Incorporated Model: EM9291 Revision: SWIX65C_02.15.01.00 5268b2 jenkins 2023/11/17 22:12:47 IMEI: 358186652429296 IMEI SV: 2 FSN: 835113217104B1 +GCAP: +CGSM' AT!impref? response: '!IMPREF: preferred fw version: 02.15.01.00 p…

it seems your firmware version is a bit old, see if you can upgrade it. BTW, how about using AT!BAND=09 for using LTE band?

We are trying to update the firmware on the device, but this fails like this: fw-download-tool -f /data/5g-fw -w SWIX65C_02.17.08.00.cwe -n SWIX65C_02.17.08.00_GENERIC_030.081_001.nvu -t 1 -m 4 Application version: 1.0.2412.2 INFO: QDL Port: INFO: Device Path: /dev/wwan0mbim0 INFO: Device Port: 0…

See if this helps [image] Unable to upgrade firmware for EM7411 MC/EM Series Thank you, that worked! For anyone that stumbles into this, the solution to load a firmware into the EM7411 is to make sure you specify BOTH the tty and cdc devices (the -d and -p flags), AND th…

The forum post you linked for FW update seem to say that the solution is to have both tty and wwan devices available, however we do not see any USB device in our system at all, so this does not help us. It also does not seem to help to use AT!BAND=09

EM9291 Registration Issues

IoT Modules MC/EM Series

jyijyi June 16, 2025, 3:34pm 16

you need to see here on pin 20 and pin 22 for USB usage

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EM9291 Registration Issues

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