EC2x is not recognized

My EC25-E-mini PCI E does not work properly, and the module cannot be found in the computer. No ttyUSB0, ttyUSB1, ttyUSB2, ttyUSB3. Is there any solution?

Dear Jerry,
Thanks for your inquiry in Quectel forum.
About your issue, whether you have modify your Linux kernel code to add module USB driver ? Please doubel check it. The following is the user guide to guide you how to modify the code, please check. Thanks!
Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.8.pdf (1.1 MB)

Thank you for your answer. My problem may have appeared on the motherboard.

ok, got it. If you need any support, please do not hesitate to ask here. Thanks!