5G modem on Raspberry Pi 5: Can't see USB

Sixfab 5G Modem Kit
1

Trying to bring-up modem for first time and get it on the T-Mobile network.
Can no longer see usb0 when I do ifconfig.
Have disconnected everything but the modem.
Have done atcom AT+CGDCONT=1,"IPV4V6","fast.t-mobile.com"
Have done atcom AT+CFUN=1,1
ifconfig gives eth0, eth1 (which has an IP address), lo
How do I get back to a state where I can see usb0?

2

Additional detail: lsusb shows the Quectel modem at Bus 004 Device 002.

3

Hi,

Run lsusb and confirm the modem is listed. If it appears (e.g., Bus 004 Device 002), the modem is detected.

Check if usb0 is visible:

ifconfig -a

If not, reboot the Raspberry Pi:

sudo reboot

Inspect dmesg logs

Look for USB or modem-related errors:

dmesg | grep -i usb