HP 3600n resetting to factory settings?

I have managed to select chinese language during initial setup of Color
Laser Jet 3600n. Now, after power up, I am presented with chracters I
can not understand at all. I can print and access printer by network,
but this can change just JetAdmin (Print Server) language. I would like
to change panel manus to english or something more readable. I suppose
there should be some kind of cold reset, or reset to factory settings,
but there is no such information in manuals, and even HP chat service
has not helped me. Is there hope, or should I try to find some chinese
fellows with tehnical knowladge?