I stupidly updated my Davinci Mini W to the latest FW, this caused all non genuine NFC cards to throw up an error and not print.

After trying many new UIDs and tags it was looking like I needed to downgrade the FW, the latest FW blocked the use of modfreakz flasher, so I ordered a J-Link EDU mini.

I was sitting thinking about an old post I read about the printer being able to boot an old FW if you held the front button and powered on. (sorry cant remember who posted this info, but thanks).

I did this and the flasher reported a fw of 1.0.1 so I selected 1.2.3 and flashed it as an upgrade.

Now all my tags are working again and can finally print.

edit - It seems all tags that the printer tried while on the updated fw are still blocked! but new UIDs are woring fine