They worked until I installed the October 2020 firmware update used my HP M180nw printer. Now the printer doesn't recognize them and keeps throwing a feed error. I'm glad Revain has a great return policy as they return as my printer is now a gigantic paper weight. Looks like I'll have to settle down and spend over $200 on a new HP toner or buy a new printer. I'll probably just go back to Cannon printers.
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