tried plustek opticpro st12 got: ugen0: vendor 0x07b3 product 0x0600, rev 1.10/0.00, addr 2 ugen0: setting configuration index 0 failed device_attach: ugen0 attach returned 6 ugen0: at uhub0 port 1 (addr 2) disconnected and even /dev/ugen* doesn't exist so sane-find-scanner is unable to find anything