No ttyUSB ports detected

~/wp7605Recovery$ swiflash -m “wp76xx” -i custom-firmware.spk
No ttyUSB ports detected; please make sure your device is connected and the udev rule is enabled, or try to power cycle the device.

Use -f option to bypass this check.

Cannot find usb port after install this Mobile Broadband Package for Linux (SDK, Drivers, Documentation)

in SW403 of mangoh yellow board, switch 2, if you put it to another side, do you see the USB port for download?