Can't load firmware to HP LJ 1018

[Konstantin Svist]

I'm trying to set up HP LaserJet 1018 which requires some binary
firmware download on each powerup (documented in foo2zjs
https://github.com/koenkooi/foo2zjs/blob/master/INSTALL)
I've set up devd rule but it didn't work.. so I tried to do it manually:

(as root user):

> usbconfig dump_info:
ugen0.4: <Hewlett-Packard HP LaserJet 1018> at usbus0, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON (98mA)

> cat /usr/share/foo2zjs/firmware/sihp1018.dl > /dev/ugen0.4
cat: stdout: Input/output error

How do I get this working?