<div dir="ltr">Hi Bjørn et al., <div><br></div><div>The issue was indeed that somehow NVRAM settings did change, I was able to set some of these back to normal and the modem came up as expected. </div><div>I've noticed that other settings have changed so the modem is unreliable to use as of yet.</div><div><br></div><div>For instance:</div><div><br></div><div><p style="margin:10px 0px 0px;padding:0px;color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px">Working MC7455 at default settings:</p><div class="gmail-preformatted gmail-panel" style="margin:9px 0px;padding:0px;border:1px solid rgb(204,204,204);background:rgb(245,245,245);font-size:12px;line-height:1.33333;font-family:monospace;border-radius:3px;color:rgb(51,51,51)"><div class="gmail-preformattedContent gmail-panelContent" style="margin:0px;padding:9px 12px"><pre style="margin-top:0px;margin-bottom:0px;padding:0px;max-height:30em;overflow:auto;word-wrap:normal;word-break:normal">AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
SIMLPM 0x01
USBSERIALENABLE= 0x01
SINGLEAPNSWITCH 0x01
</pre></div></div><p style="margin:10px 0px 0px;padding:0px;color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px">Broken MC7455:</p><div class="gmail-preformatted gmail-panel" style="margin:9px 0px;padding:0px;border:1px solid rgb(204,204,204);background:rgb(245,245,245);font-size:12px;line-height:1.33333;font-family:monospace;border-radius:3px;color:rgb(51,51,51)"><div class="gmail-preformattedContent gmail-panelContent" style="margin:0px;padding:9px 12px"><pre style="margin-top:0px;margin-bottom:0px;padding:0px;max-height:30em;overflow:auto;word-wrap:normal;word-break:normal">AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01</pre></div></div></div><div><br></div><div>Thanks for the help!</div><div><br></div><div>--</div><div>Paul<br><div><br><div><br></div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 11 October 2017 at 12:36, Bjørn Mork <span dir="ltr"><<a href="mailto:bjorn@mork.no" target="_blank">bjorn@mork.no</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">Paul Gildea <<a href="mailto:gildeap@tcd.ie">gildeap@tcd.ie</a>> writes:<br>
<br>
> Here is the new output where the cdc-wdm interface is not created:<br>
><br>
><br>
> [ 34.784426] usb 2-3: New USB device found, idVendor=1199, idProduct=9071<br>
><br>
> [ 34.784428] usb 2-3: New USB device strings: Mfr=1, Product=2,<br>
> SerialNumber=0<br>
> [ 34.784430] usb 2-3: Product: MC7455<br>
><br>
> [ 34.784432] usb 2-3: Manufacturer: Sierra Wireless, Incorporated<br>
><br>
> [ 34.786401] qcserial 2-3:1.0: Qualcomm USB modem converter detected<br>
> [ 34.786504] usb 2-3: Qualcomm USB modem converter now attached to ttyUSB0<br>
> [ 34.787384] qcserial 2-3:1.2: Qualcomm USB modem converter detected<br>
> [ 34.787475] usb 2-3: Qualcomm USB modem converter now attached to ttyUSB1<br>
> [ 34.788347] qcserial 2-3:1.3: Qualcomm USB modem converter detected<br>
> [ 34.788439] usb 2-3: Qualcomm USB modem converter now attached to<br>
> ttyUSB2<br>
><br>
> The only differences I can see are that the "Product:" has changed and the<br>
> "SerialNumber:" is missing. When I check the device path the Serial file is<br>
> not there. I can connect to the device and send AT commands no problem as<br>
> the USB interfaces are enumerated. Any idea what may have caused this?<br>
> Modem is no longer usable with qmicli, for some reason qmi_wwan is not<br>
> creating the interface?<br>
<br>
</span>The only possible reason I see is that there are no RMNET/QMI functions<br>
and no serial number string descriptor. Please veriy by doing e.g<br>
<br>
lsusb -vd 1199:9071<br>
<br>
Both the RMNET functions and the serial number export are controlled by<br>
firmware config. I cannot explain why the configuration changed, but it<br>
should be easy to fix since you still have AT command access. Assuming<br>
that there isn't anything more serious wrong here - unexplained NVRAM<br>
changes are not good... You may want to let Sierra Wireless take a look<br>
at the modem if you have that option.<br>
<br>
Please see the documentation of the AT!USBCOMP and AT!CUSTOM commands in<br>
the "AirPrime EM74xx/MC74xx AT Command Reference" for info on how to<br>
change the settings back to normal. I believe the serial number custom<br>
setting is “USBSERIALENABLE”.<br>
<span class="HOEnZb"><font color="#888888"><br>
<br>
<br>
Bjørn<br>
</font></span></blockquote></div><br></div>