Use of Non HP Toner Cartridges

[stumcg]

Printer has been working fine for several months since I loaded non-HP compatible cartridges.  I wasn't concerned abpout the HP disclaimer about faults caused by non-HP cartrdiges would not be covered by warranty, as the printer was already out of warranty.  .  Printed OK this morning, but later this afternoon it won't print at all and now displays the message 'Indicated cartridges blocked for containing a non-HP chip. More at www.hp.com/learn/ds'. 

The linked page confirms that ' Updates can improve, enhance, or extend the printer’s functionality and features, protect against security threats, and serve other purposes, but these updates can also block cartridges using a non-HP chip or modified or non-HP circuitry from working in the printer, including cartridges that work today.'  

I had automatic firmware updates enabled (foolishly now it would appear).  The firmware datecode is 20211109 which I presume corresponds to 9 Nov 2021 so why has it just stopped working now?

Is there an easy way of rolling the firmware back to the previous version.

[sandytechy20]

@stumcg

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[Harald_XY]

Exactly(!) the same here.

Cartridge Protection is set "Off"