Can toner powder be universal?

Toner powder are not universal. The universality of toner powder depends on multiple factors, including electrical properties, magnetism, etc. Specifically: Electrical properties: The electrical properties of toner powder must be consistent. Magnetic properties: Magnetic powder can barely replace non-magnetic powder, but non-magnetic powder can never replace magnetic powder.

How not to do firmware updates?

HP users are facing fresh frustration after a firmware update left some of its printers inoperable, displaying error messages that prevent them from using even HP-branded ink cartridges. Complaints have flooded HP’s support forums and social media, with affected devices stuck in a non-functional state. The Ars Technica website reports that the fault appears linked to HP’s Dynamic Security update. […]

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