I have a similar one and could never get the firmware uploading (foo2zjs / hplip) to work reliably. It would randomly stop working and then need an undetermined number of power cycles / USB repluggings to come back. I should have an other go with that. It was a lovely setup when it worked, printing from any OS incl. mobile without cables or funky drivers.
I got mine in 2006. Hooked up to my NAS and HPLIP and CUPS. Unfortunately foo2zjs is discontinued and there's a bug with HPLIP. You have to power it on twice to load the firmware ...