RG255C M.2 module driver not working

Almost all the Qualcomm Chip modem is not recommended to try RNDIS.
I haven’t tested it.

Okay, thank you.
Now we are managed to set up the device, we were able to connect it to 4G and even 5G SA. The only problem we are sturggeling with is the we cannot acces the internet from the Windows laptop, the ping are successfull from the module and the module gives Ip address to the laptop so the dhcp should be fine. Is there more configuration needed between the laptop and the module, or we should try an other mode (not ECM)?

Why not try
AT+QCFG=“usbnet”,0

Have you installed the NDIS driver?