Em7430 no com port after vid:pid change

[jyijyi]

seems same issue as this one

MC7455 stuck in MBIM-only USB composition

So the only solution was to try the tools you sent to me… And it worked! That’s really great job! I let you decide whether it’s worth sharing, as far as I’m concern I keep it safe in case it happens again. I think I misused AT!USBCOMP and AT!USBPID commands, hence entering into an unexpected mode… But you sometimes need to expect the unexpected. Thank you very much for your kind and fast help on this! Edit: Here are more information on the root of it. These are the commands I had used: AT…

@dl5162 , any idea how to solve this?

[dl5162]

Yes, looks like exactly the same issue.

I don’t have any better idea than what’s discussed in the discussion you linked to. My last post there includes a link to a .nvu file which might fix the problem. Or make it worse. All warnings are still applicable.

[phucha]

i will try to flash this .nvu and give you the result i get. but anyway i have ordered the new module and stick with verified vid:pid.

[phucha]

well, i have flash your .nvu with lastest generic .cwe. still cannot fix this problem. so i have brick this module. good bye 8$

[phucha]

oh god, i did fix this by many many wierd steps on both Windows10 and Ubuntu 20.04, thanks you @dl5162 , this .nvu is helpful to change the pid, so driver and usb bus can be detected, my works are:

1. using physical pc, dont use virtual machine with usb passthrough because the vm host will not detect usb bus without driver
2. Clean the hardware, m2 pin, m2 adapter pin to avoid pin missing or short
3. must know the device usb setting, i remember it was 3 so i plug it on usb 3.0 port
4. Plug in on windows 10, install the driver with flag DisableUsbCompAutoUpdate=0, it help release the wrong usb bus of device so it can be register
5. flash our .nvu with generic cwe firmware, it help change my vid:pid from 1199:68b1 to 1199:9071, i am using the fdt tool downloaded on the sierra device page with flag -d g5k -fd “firmware folder path” -f generic firmware.cwe bjorn.nvu -log. It run without any issue, device flash and restarted
6. Well, now it have accepted vid:pid, boot up an Ubuntu machine, using swi_script or the qmicli command to set device work mode to 6 or 8, i was set it as 6
7. Now booting it back to windows, unistall driver, reinstalling it with flag DisableUsbCompAutoUpdate=1 GPS=1 GPSAUTO=1 USBCOMP=6 WIN8BUSDriver=1, after done, it will detected the com port inside device manager, well
8. I am not likely use connect the com with Huawei Modem driver in Windows, i think i will be safer to connect it with minicom or putty in ubuntu so i boot it back onto ubuntu and ttyUSB registered as well

thats my adventure with my em7430

[phucha]

@jyijyi @dl5162 Thanks you so much for helping me with helpful advise. Have good day !

[dl5162]

Thanks for sharing that procedure. It helps a lot in case anyone else hits this issue.

And great to hear that you were able to rescue your modem. I do find it amazing that this config, made by a tool I hacked together based on reverse engineering .cwe and .nvu files, is able to fix a problem like this. I have never seen any docs describing the file format or the firmware mechanism it uses, so there are obviously large holes in my understanding. But good enough is good enough

[phucha]

yeah, hope it help anyone-else who need. em74xx are very widely used