[SOLVED]N211: AT+CFUN returns ERROR after FM-update

[M.Bend]

I’m currently working on getting used to the SARA N211 on my NB-IoT Shield. At first it didn;t respond to a lot of AT commands, so I figured the firmware could use an update. After updating some commands work fne now, others are still not working (AT+NSOCR for example). Yet now I’m facing a new issue.

Whenever I try the AT+CFUN=1 command it simply returns ERROR. I see there’s a post with a similar issue here:

AT+CFUN =1 returns Error 4 (SOLVED)

Hi everyone, I recently got my Sodaq NB-IoT Shield with Crowduino M0 (https://shop.sodaq.com/en/nb-iot-shield-deluxe-dual-band-8-20.html). I also used this sketch (http://support.sodaq.com/sodaq-one/at/) to pass AT commands to ublox module (02B SARA N211). However, not all AT Commands work. For example, AT+CFUN=1 returns error code 4 (not supported) when other commands to acquire version or change some configurations of module return OK. AT + CIMI returns just OK without displaying IMSI of SI…

Yet the cause if this issue was a wrong SIM card. I’m using a Vodafone NB simcard that has worked fine on my R410M, so I’m guessing my sim card is fine?

My current FM-version is: 06.57,A09.06.

Do you have any ideas, because I’m out of them…

~Michael

[M.Bend]

I found this piece of info:

AT+CIMI returns an ERROR for me as well, so it might be the SIM?
How does one check if a sim is either 1.8V or 3V?

Note: I’m using the T-Mobile SIM card that was provided by SODAQ in the NB-IoT Shield kit.The sim has worked on the previous FM version, so a sim issue can’t be possible right?

[Jan]

@M.Bend

The N2 modules need to be updated to 06.57,A07.03 before updating to 06.57,A09.06.
We had issues with the N211 modules when skipping the 06.57,A07.03 that a lot commands returned ERROR.

This was solved by downgrading to 06.57,A07.03 and re-upgrade after this to 06.57,A09.06.

Can you downgrade and re-upgrade your shield?

Best regards,
Jan

[M.Bend]

Thanks a lot @Jan, worked like a charm!