I have the same problem but when I click on the download link to the old firmware, it tells me that it is no longer available. Can you tell me where I can find it or maybe send it to me? I just bought new toner cartiges for this thing and right now it is useless to me... :-( Thank you in advance for your help with this.
P.S. I can't believe that HP is still allowing customers to download and install this obviously faulty upgrade. :-/