HP 'timebomb' prevents inkjet printers from using unofficial cartridges

Delayed effect of March 2016 software update sees third-party printer cartridges stop working in Hewlett-Packard machines

Hewlett-Packard printers have suddenly started rejecting ink cartridges produced or refilled by third parties, apparently due to a "ticking timebomb" left by the manufacturer in an update released in March 2016.

The printers, in the company's OfficeJet, OfficeJet Pro and OfficeJet Pro X ranges, accepted refills made by third-parties and sold at a significantly lower price than the official ink made and sold by HP itself. But on 13 September, the printers began to reject those refills, with error messages including "cartridge problem", "one or more cartridges are missing or damaged" and "older generation cartridge".