Please try the driver I sent.
Hi @Bean.Wang-Q . I am also facing the same problem I am using UMTS<E EVB V2.2 with EG800G. I tried to install the drivers as mentioned above but not able to solve the problem. Could you please send the driver.
Here is the Screen Shot for that.
Please download it from the DownloadZone.
https://www.quectel.com/download/quectel_windows_usb_driveru_v1-0_en/