If you’re unsure what you can remove safely, don’t put it in the Trash, but move it to a folder in Documents for the time being, so you can replace it if necessary.Ģ. If you really want to be thorough, take a look in /Library/Printers too, but be a bit more cautious there as ist and some of the contents of the PPDs folder can be important. Check through /Applications and /Applications/Utilities, and uninstall or remove old printer software from there. Open the Printers & Scanners pane, select any redundant printers listed there, and use the – tool to remove them. In all other cases, before you even turn the printer on, uninstall and remove all old printer support from the Mac. If the Mac you are going to install the printer on has never supported a printer, and hasn’t been migrated from a Mac which has, you won’t have any old printer support software, and can move straight on to step 2. All is not lost, though: follow these steps and you shouldn’t have to send that printer for recycling, or give it away. In the meantime, we recommend users experiencing this problem to uninstall the HP driver and use the native AirPrint driver to print to their printer.MacOS Mojave doesn’t make any great changes in printing, but printer support has become a bit more complex, as Apple has stopped updating its list of compatible printers, and appears to have also stopped updating the drivers it supplies for older printers, to focus support on AirPrint instead. This caused a temporary disruption for those customers and we are working with Apple to restore the drivers. "We unintentionally revoked credentials on some older versions of Mac drivers. In a statement to The Register (opens in new tab), HP provided provided further insight on the issue, saying:
Your HP printer will now be able to print normally on macOS and the “encryption credentials have expired” message should no longer appear in the print queue.
This will uninstall and remove the printer from the list and you'll need to click on the plus icon to re-add it. Once this done, you'll need to return to the Printers & Scanners area, right-click on your printer and select the “Resent printing system” option. This will generate a new certificate for your printer that will be valid for 10 years. From the printer's web page, users will need to follow the steps from HP's knowledgebase (opens in new tab) to generate a new Self-Signed certificate for their printer. Here you'll need to double-click on your printer and select “Printer settings” and the click “Show Printer Web Page”. To get started, affected users need to remove the /Library/Printers/hp folder from their devices to delete any old drivers that have been incorrectly flagged as malware.įrom here, users should open System Preferences on their Mac and head to the Printers & Scanners area.
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