Baku, September 20, AZERTAC
Large numbers of HP printer owners found their printers stopped recognising unofficial printer ink cartridges on 13 September, according to BBC.
Dutch printer ink vendor 123inkt said it had received more than 1,000 complaints in one day.
HP said that during its last firmware update, settings had been changed so HP printers would communicate with only HP-chipped cartridges.
It also said some devices already had the functionality built-in.
123inkt said it did not believe that a firmware update had been issued since March 2016, suggesting the change had been pre-programmed to roll out this month.
HP said such updates were rolled out "periodically" but did not comment on the timing of the last instalment.
"The purpose of this update is to protect HP's innovations and intellectual property," it said in a statement.
It has angered some of its customers as HP branded cartridges are notably more expensive than unofficial brands.