Printer manufacturers really want you to buy their genuine, overprices ink cartridges and toners. The following article is kept for reference as it was the only way how to solve the issue with non-working OfficeJet printers for about one month after the blocking mechanism previously built to HP firmwares was triggered by the right date. Direct link to official 8610 firmware is here. For more information and link to official firmware fix click here. UPDATE : HP finally surrendered after massive complaints of customers and released official firmware updates disabling the blocking mechanism for older and non-genuine cartridges.

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Hp officejet pro 8620 hack