Has anyone used Precisions chipless kit for the SC-P800?

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Lucky, as some of them don't care about the environment. HP are still crippling laser printers so they won't take 3rd party toner carts. One OTA update knocked out many printers recently. I think it will take a Class action to stop them doing it.

FWIW: if you can get hold of older firmware updates that don't have the third party crippling function you can extra the necessary file to a memory stick and use that to revert your firmware to an older version.

https://support.printerpotty.com/2022/hp-firmware-downgrade