@Heterokromia@yogthos Do you have a picture of the error message it gave you? I'd love to see it.
Bricking when presented "unauthorized" ink or toner is well-known for HP of the last X years, but I hadn't heard of them doing it when you block their network access.
For many years I've been telling people who ask "Buy an HP laser printer. Just don't buy a new one." There's a huge market for used office printers, and you can get one old enough that it will use 3rd-party toner.