Em7430 no com port after vid:pid change

[phucha]

i have module em7430, OEM dell dw5816e, connect to PC with USB 3.0 converter
i have flash the Generic firmware, and it work fine. After that, i am working to make it work with my current country cellular, so i try to change VID:PID, IMEI and USBCOMP with AT command as bellow:
AT!USBVID=1199
AT!USBPID=68b1
AT!USBCOMP=1,3,10D
AT!OPENLOCK… → change imei with openlock code and NVIMEI command
AT!RESET

So, the problem come. after modem reset, it come with mbim but no other com port detected
i was try alot of method but nothing works. flash firmware, swi_comport script, complie and install MBPL USB serial, etc…

only i have now is MBIM interface (dmesg result)
[17081.238278] hub 3-0:1.0: USB hub found
[17081.238343] hub 3-0:1.0: 15 ports detected
[17081.572134] usb 3-1: new SuperSpeed USB device number 2 using xhci_hcd
[17081.594832] usb 3-1: New USB device found, idVendor=1199, idProduct=68b1, bcdDevice= 0.06
[17081.594838] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[17081.594839] usb 3-1: Product: EM7430
[17081.594841] usb 3-1: Manufacturer: Sierra Wireless, Incorporated
[17081.594842] usb 3-1: SerialNumber: LR84727330031013
[17081.618356] cdc_mbim 3-1:1.0: cdc-wdm0: USB WDM device
[17081.619674] cdc_mbim 3-1:1.0 wwan0: register ‘cdc_mbim’ at usb-0000:02:1b.0-1, CDC MBIM, 72:6f:9d:d8:b1:a4

Whats solution i be able to try now ? anyway to reset or fix this ?

[jyijyi]

How about this?

MC7304 loses mobile connection and won't auto-reconnect until power cycle

I’ve inherited support for a bunch of Windows 10 industrial tablets which have embedded MC7304 modems in them. These units are installed onboard trains which I don’t have easy physical access to. The issue I have is that sometimes a unit is booted and the modem never connects, and sometimes it boots, connects OK, then some point loses connectivity and never reconnects. Most of the time though the units work as expected (connect, auto-reconnect if connection is lost, etc). From what I can tel…

You might also need to modify the mbpl serial driver to add the new pid 68b1.

[phucha]

I have try that way, by navigate to C:\Program Files (x86)\Sierra Wireless Inc\Driver Package and using DriverInst to do some driver change with xml file… not fix this. i was try with flag USBCOMP=8 as 73xx but its not work also

[jyijyi]

You might also need to modify the mbpl serial driver to add the new pid 68b1.

[phucha]

i am not clearly understand, would you explain that more detaily ?

[jyijyi]

Some idea like this one:

Rescue MC7710 after incorrect PID change?

The router OS does not give more specific information, but I put it into a Linux box and got the full descriptor listed in the attachment below. But note that lsusb gives an error message (Couldn’t open device…) because there is no driver available. So it looks like only the product ID is incorrect. Before I messed up the product ID, the router OS listed 5 channels for this device, and the descriptor listing shows there are 5 interfaces, even though none is accessible. If everything else …

I also see the qcserial.c in MBPL usb driver where you might add your pid:

[phucha]

thanks you, i will try it

[phucha]

after alot of trying, it showing serial port on dmesg, but it was not registered as ttyUSB device
my works are adding device vid pid on qcserial.c as bellow → re-complie and install it with make → reboot → using modprobe to registering new device

i am adding on both static const struct , also try again with another module type 74xx as {DEVICE_SWI(0x1199, 0x9078)}, /* Sierra Wireless EM74xx */

this is dmesg result on ubuntu 20.04:

i am using virtual machine with usb passthough, should i try it with ubuntu live usb ?

[jyijyi]

Here suggests to use qmicli

My MC7710 can't work on Linux after plug-in it to Windows8

A lot has happened in the 7+ years since that was written. So, while it still is possible to use the hackish perl script, I recommend using libqmi/qmicli instead. The get/set-usb-composition commands do exactly the same as the perl script: bjorn@miraculix:~$ qmicli --help-dms|grep swi --dms-swi-get-current-firmware Get Current Firmware (Sierra Wireless specific) --dms-swi-get-usb-composition …

[phucha]

thanks you for the advice, but it is not work
the command results are:

error: couldn’t get USB composite modes: QMI protocol error (94): ‘NotSupported’

i was try with both composition 6 or 8 or with 1, none of them give the correct responve

[jyijyi]

Can you paste your modified qcserial.c here?
Does it work for adding new pid in option driver?

Rescue MC7455 after incorrect PID change?

This should be easy to fix on Raspbian provided it has a USB serial driver we can use. Try option first: modprobe option echo 1199 90xx > /sys/bus/usb-serial/drivers/option1/new_id You’ll have to replace the “1199 90xx” with the modems current PID and VID. If that works, then youl’ll have a number of ttyUSBx devices and just have to try which one is the AT serial function. I assume you know how to go from there since you’ve already changed the PID. If you got a write error, then your Rasp…

[phucha]

qcserial.c (30.6 KB)
this is the modified file that i complie and install with usb-src, you can searching the line with “edited” explain mark
i was try command modprobe and echo for each driver type i have installed, none of them give me the ttyUSB device registred

[jyijyi]

shouldn’t you modify like the line having “/* Sierra Wireless MC74xx */”?
e.g.
line 176,336,368

[phucha]

yes i will try this again

[phucha]

it do not work so, the same result as before

dmesg detect 3 serial port, but i still cannot register that port to ttyUSB device

484.081425] usb 2-5.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 484.081432] usb 2-5.1: Product: EM7430
[ 484.081437] usb 2-5.1: Manufacturer: Sierra Wireless, Incorporated
[ 484.081443] usb 2-5.1: SerialNumber: LR84727330031013
[ 484.084272] usb 2-5.1: Enable of device-initiated U1 failed.
[ 484.085209] usb 2-5.1: Enable of device-initiated U2 failed.
[ 484.085703] usbserial_generic 2-5.1:1.0: The “generic” usb-serial driver is only for testing and one-off prototypes.
[ 484.085716] usbserial_generic 2-5.1:1.0: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
[ 484.085729] usbserial_generic 2-5.1:1.0: device has no bulk endpoints
[ 484.111536] cdc_mbim 2-5.1:1.0: cdc-wdm2: USB WDM device
[ 484.112562] cdc_mbim 2-5.1:1.0 wwan0: register ‘cdc_mbim’ at usb-0000:00:14.0-5.1, CDC MBIM, 76:1d:b8:61:fd:82
[ 484.113265] usb 2-5.1: Enable of device-initiated U1 failed.
[ 484.114105] usb 2-5.1: Enable of device-initiated U2 failed.
root@NUC9i5QNX:~#

lsusb -t are just showing 2 mbim interface port

: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 10000M
|__ Port 4: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 5: Dev 3, If 0, Class=Hub, Driver=hub/4p, 10000M
|__ Port 1: Dev 6, If 0, Class=Communications, Driver=cdc_mbim, 5000M
|__ Port 1: Dev 6, If 1, Class=CDC Data, Driver=cdc_mbim, 5000M

i was try the modprobe and echo, but it do not work anyway

[jyijyi]

Is this linux pc ok to connnect good module before to show ttyusbx ?

I saw these new lines

[ 484.085703] usbserial_generic 2-5.1:1.0: The “generic” usb-serial driver is only for testing and one-off prototypes.
[ 484.085716] usbserial_generic 2-5.1:1.0: Tell linux-usb@vger.kernel.org to add your device to a proper driver

[phucha]

no, ttyUSB device wasnt found on /dev
ls /dev/ | grep USB result nothing
i was intall ubuntu and troubleshoot it with physical pc on today, but it seem doesnt work ethier

[jyijyi]

So this pc has never successfully connected ttyusbx port before for good module?

[phucha]

i have em7355 module and it work fine , showing 3 ttyUSB0,1,2 even no driver or anything else installed

[phucha]

maybe my module are broken after that PID change, i was thought about order new one with my local ecommerce shop