I have a bunch of EM7455 modems, all of them are updated to latest fw for now, and I have a problem that modems sometimes starts to reboot every ~2 minutes, here is the info from one of them: at!image? TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID FW 1 GOOD 1 0 0 ?? 02.3…

It seems like just disabling GPS with AT!CUSTOM="GPSENABLE",0 helps. I can live without GPS, but proper bugfix in firmware will be nice. Anyway, thanks for helping!

Will the at!gcdump be same if you clear it by at!gcclr ? Does at!rmareset help on the issue? Does it reboot in linux? How about other old firmware? [image] How to find older firmware for MC7403 MC/EM Series Does the fw release note help? https://source.si…

Thanks for response. Looks like it is somehow related to network quality, or providers in my area are doing something with the network, because these reboots can continue for several hours, mainly in the night time, and then all of the tested modems magically stop rebooting, no matter what firmware …

if data channel is not established for host platform, will there be any reboot?

Yes, reboots are happening without data enabled, and stops only if you quickly put the modem in LPM via AT+CFUN=0 before it reboots. If you put it back to normal mode, then after some time (1-2min) it will reboot.

if you change another SIM with other operator with better signal strength RSRP, will there be any improvement?

I tried to use another operator’s SIM, but it did not help.

What if you use other lte band?

The providers whose SIMs I tested use different bands, B3 and B20 in my case, so it doesn’t matter what band modem is using.

does it work with 3G WCDMA? Does it relate to antenna? Did you connect diversity antenna?

Sorry, I can’t check with WCDMA only, as both providers, whose SIMs I have, decided to disable WCDMA in most of the areas, mainly where LTE coverage is somewhat good, leaving only GSM and LTE. It doesn’t matter what antennas I use, I tried antennas with better sensitivity, no changes. Yes, I’m con…

EM7455 reboots constantly

IoT Modules MC/EM Series

jyijyi June 26, 2026, 11:57pm 2

Will the at!gcdump be same if you clear it by at!gcclr ?

Does at!rmareset help on the issue?

Does it reboot in linux?

How about other old firmware?

Topic		Replies	Views
EM7455 unexpected reset after few hours of work MC/EM Series	3	1330	February 28, 2022
MC7455 device crashing and other issues MC/EM Series	4	1361	January 31, 2019
MC7455 stops working MC/EM Series	15	852	October 29, 2021
Unexpected Modem Resets EM7455 MC/EM Series	1	549	April 29, 2022
MC7455 bootloop MC/EM Series	5	858	March 23, 2023

EM7455 reboots constantly

Related topics