was the problem. As he did, I had I used a tty cable to directly wire into the EC25 card, to issue AT commands.
AT+QCFG=“usbauto”,0
AT&W
AT+CFUN1,1
fixed it. The /dev/ttyUSBx ports have returned, and it’s no longer stuck in RNDIS mode.
Commands like ‘AT+QCFG=“usbnet”,2’ had no effect, as long as “usbauto”,1