Simpler solution than the one given above: (from a clean 8.10 install)
$ getweb 1018 $ arm2hpdl sihp1018.img > sihp1018.dl $ sudo cp sihp1018.dl /usr/share/foo2zjs/firmware/
Then unplugged and replugged in the printer.
Simpler solution than the one given above: (from a clean 8.10 install)
$ getweb 1018 foo2zjs/ firmware/
$ arm2hpdl sihp1018.img > sihp1018.dl
$ sudo cp sihp1018.dl /usr/share/
Then unplugged and replugged in the printer.