Error after AT+COPS and AT&F command

LTE-M / NB-IoT (Monarch)
1

Hello,

I’am facing a very strange issue after the following AT command on one of our boards : “AT+COPS=1,2,20801,7”

The modem returns : “EXIT: exception: 3 ITYPE: 0x30060 PC: 0x1c20f07c EVA: 0xffffffd4”

Could you please help me ?

(note : fw version is 8.2.1.0)

I tried to make an AT&F command, but it also failed…

Thanks

2

Do you mean it works on other boards but only fail in this board?

You could try to type command AT+COPS=1,2,”20801”,7 the 3rd parameter “oper” format is string

What AT commands did you used before AT+COPS=1,2,”20801”,7 ?
could you also try to type below commands and provide us the output?

AT+CEREG?
AT+CGDCONT?
AT+CGACT?
AT+COPS?
AT+CSQ
AT+SQNMONI=9

3

Hi Eros,

thanks for your feedback.

Yes I have the issue only in one board, and this board was OK at the begining.

Find attached the output of my board. I did not see that before, there is an issue with the AT+CGDCONT command.

Note : The exactly same software loaded into an other board works (with the same modem firmware version) !

log_output.txt (11.0 KB)

The outputs of the command you ask me to test are below (it seems that the modem has succeed to connect to the network…) :

Ask:AT+CEREG?
Modem Answer OK :
+CEREG: 2,5,“BD84”,“09A2C807”,7

OK

Ask:AT+CGDCONT?
Modem Answer OK :
+CGDCONT: 1,“IP”,“”,0,0,0,0,0,0,0,0

OK

Ask:AT+CGACT?
Modem Answer OK :
+CGACT: 1,1

OK

Ask:AT+COPS?
Modem Answer OK :
+COPS: 1,2,“20810”,7

OK

Ask:AT+CESQ
Modem Answer OK :
+CESQ: 99,99,255,255,12,41

OK

Ask:AT+SQNMONI=9
Modem Answer OK :
+SQNMONI: F SFR Cc:208 Nc:10 RSRP:-99.60 CINR:0.90 RSRQ:-13.70 TAC:48516 Id:324 EARFCN:6300 PWR:-78.12 PAGING:256 CID:0x9A2C807 BAND:20 BW:10000 CE:0

OK

Thanks,

Pascal

4

Thanks Pascal. The attachment looks ok.
I think you could try if factory reset could recover, type AT+SQNSFACTORYRESET, wait for a while and reboot the device.

5

Thanks Eros,

I have tried AT+SQNSFACTORYRESET or AT&F and I always have “operation not supported” error :

image
image374×387 2.16 KB

I do not understand why the command fails.

6

Factory reset fail could be due to no restore point created before. The other way you could try is using SFU tool to upgrade & refresh sw. Do you know how to do sfu upgrade and do you have the Sequans FW and sfu.exe?

7

Thank you, Eros,

I’m familiar with this tool, but on our board there is no direct link implemented between the modem and a PC via the UART port. We were expecting FOTA to be available, but it seems that with our current firmware revision (8.2.1.0), this is not possible.

Even the AT&F command fails (although no restoration point is required). Do you have any suggestions?

If not, I assume there is no way to properly “clean” the module’s flash memory. My guess is that something went wrong in the memory, causing the firmware to become unstable.

My main goal is to understand what happened so we can prevent the same issue from occurring on other boards. I f you have any suggestions….

Thanks,
Pascal

8

I see, I will suggest you to use DM light to download the crashdump first. The crashdump file might provide us some information. Also, if you remember what ‘s the scenario you used ( or what’s the AT commands you used ) before the issue, that will be help.

Do you know the DM light tool? which is the debug tool to check modem status and capture debug logs.

9

Thanks Eros,

could you please give me some documentation and links to download this tool ?

I will see if it is possible to use it to get some modem logs through our board.

Have a nice day,

pascal