Hello everyone! I’m having trouble with the serial device for my EM7455B. The device isn’t showing up. ~# lsusb Bus 002 Device 001: ID 1d6b:0003 Linux 5.15.150 xhci-hcd xHCI Host Controller Bus 001 Device 003: ID 413c:81b6 Sierra Wireless, Incorporated DW5811e Snapdragon™ X7 LTE Bus 001 Device 002…

see if this helps: [image] EM7455 Linux Issues MC/EM Series I found the IDs by googling for DW5811e, guessing that the bood PID is one less than the application PID. Usually is. Most USB serial functions are very simple: One bulk in and one bulk out endpoint is all you n…

Thank you for responding! Unfortunately the thread you posted doesn’t help me. I didn’t change any PID. The modem is showing up on lsusb. There’s also a /dev/cdc_wdm0. The kernel modules usbserial, qcserial, usb_wwan are loaded. But there is no /dev/ttyUSB present at all.

how about echo new id to the driver? [image] EM7455 Linux Issues MC/EM Series Sure, no problems. But please take it calm and easy and don’t do anything more hasty wink Your modem had a Dell specific ID. This is made up of both a vendor ID (which belongs to Dell) and a p…

Yes. I did try that. It doesn’t have any effect. But that command would just temporary fix a wrong PID (or vendor ID), correct? And I did not change any PID.

at least can see if the AT command is enumerated

I’m not sure what you mean. Sorry I don’t know a lot about modems and how to operate them. If you’re talking about sending AT commands to the modem then I need a working serial console first. Without /dev/ttyUSB that’s going to be difficult. Correct me please if I’m wrong.

are you able to test in Windows? [image] DW5811e / EM7455 Problem with Windows 11 - failure "insert sim" MC/EM Series Hello, i installed a used "DM5811e card into my DELL notebook and did a firmware upgrade to the latest version of the card and install the original Dell …

No, unfortunately I can’t. I currently don’t have a m.2 to USB adapter that need to plug it into a Windows machine. Sorry. :frowning:

can you install windows virtual machine in your linux PC? Here says you can use windows driver to enable the AT port: [image] USSD Software for Windows 10 MC/EM Series that was the qualcomm modem i placed in my laptop [image]

I can’t do that either. It’s banana pi router with 2Gb RAM and 8Gb Flash containing the root-fs. I’m currently trying to rebuild libqmi for OpenWrt since the version that it comes with is missing SWI features that I hope I can use to change the usb composition. Maybe that gives me the serial devic…

EM7455B missing /dev/ttyUSB

IoT Modules MC/EM Series

jyijyi April 3, 2024, 3:48pm 8

are you able to test in Windows?

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EM7455B missing /dev/ttyUSB

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