Hi, After installing the Windows driver on EM7421, the network card displays a yellow bang. My operating system is Windows 10 LTSC and I use the Sierra source to download the Windows driver (build 5087) The network interface card displays a yellow exclamation mark and the mobile device cannot be found in the operating system. But other COM ports work normally. Could anyone tell me how to solve it. Thanks. [image]

are you using MBIM? what are the return of the followings? AT!entercnd="A710" aT!USBCOMP? aT!USBCOMP=? AT!USBPID?

Is it happening to all USB port? Is it only happening to Windows 10? Do you find problem to use RMNET0 instead of MBIM?

RMNET has the same problem. [image]

Is it happening to all USB port? Is it only happening to Windows 10? did you try with WIN11? BTW, did you connect directly to PC or through USB hub?

Yes, t happening to all USB port. Only happening in Windows10 this version.(enterprise LTSC) Windows 11 does not occur this problem. I’m connecting directly to the PC, not through a USB hub.

i just connected EM7511 to my win10 PC (both Win10 Pro and Win10 Enterprise), no problem is found. I am also using same AT!USBCOMP and AT!USBPID as yours.

May I know what version of Win 10 Enterprise you are testing? My test version is 1809 [image]

i tried this one: Edition Windows 10 Enterprise Version 21H2

Got it. Thanks. Another problem, we tried it on another operating system, Win 10 Enterprise LTSC (version: 21H2), and found that the module AT+CFUN parameter was always set to 0 after each reset. Although we force the AT+CFUN parameter to be set to 1, the parameter will still be switched back to 0 after resetting the module.

EM7421 windows driver install issue

IoT Modules MC/EM Series

jerry1 March 13, 2024, 3:31am 3

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EM7421 windows driver install issue

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