BG96 not saving +QCFG="nwscanmode" after reset

IoT Modules LPWA Module
1

We have one board where the BG96 always starts with default “nwscanmode”=0 and default “band” settings.

Each time I power it up I change them, then send “AT+CFUN=1,1” and those options are back at their default values. I also tried a clean powerdown with “AT+QPOWD” but same result.

Since the modem is reset to “nwscanmode”=0, I cannot use NB-IoT effectively, because each time it will restart a new network search and take more than 2 minutes to connect, instead of a few seconds.

Could it be some pin/pad soldering related problem? Is there some “reserved” pin that force the modem not to save those settings, maybe for testing purposes? A bad soldering could pull that pin to GND and activate some hidden “test mode”…

I cannot find a reason why this particular module is not working like all the other BG96 modules we have. They all have the same firmware. I even tried to reload the firmware, hoping it would clear the NV settings storage, but it does not. Is there a way to reset the module to factory settings, or clear the NV storage?

2

Hi PPescher，

  1. Normally, the settings should be stored in NV value, and the restart is still valid.
    May I know that , this issue occur in one board only ，or all board ?

  2. Try the following command at + qprtpara = 3 to see if it can solve the problem of your module.

  3. The normal flash FW can not change NV , only factory fw version will rewrite the partition of NV .
    Anymore issue , pls send email to support@quectel.com , we will setup ticket to track and do more analysis .

3

Hi Stephen,

Sending “at+qprtpara=3” did the trick! Now “nwscanmode” does not reset to 0 each time I reset or power up the module.
What does that command do? And how did the modem get stuck into that state?

Thanks.

4

Hi Pescher ，

This Cmd means that restoring factory setting .

I do know what operation has been done in your side , The root cause is that some NV has been changed .

5

Hi @Stephen.Li-Q
where i can find documentation about the at+qprtpara=3 ?

6

I can not attached doc here ，pls send email to me .

stephen.li@quectel.com thanks

7

Hi Stephen Li

I have the same problem, “at + qprtpara = 3” doesn’t work for me, is there another way? The module that I use is EC20

Thanks

8

@lasutsatu

I know it’s a late reply, just wanted to share a possible solution for saving NV.
While I was helping a customer with the NV reset command
AT+QPRTPARA=3
Out of mistake the customer has mistyped it as
AT+QPRTPARA=1
and it started to retain changed NV items thereafter.
It could have been a coincidence, but might be worth a try.

You may also try to the regular NV write command.
First restore to factory settings via:
AT&F
Or
AT+QCFG=“nvrestore”
Then write the NV via:
AT&W

Good luck!
BillA