I know this is an old thread now but for those wanting to avoid the POPL issues but still have a digital business card generator app, https://www.hihello.me/ seems to fit the bill. The great part is unlike many other digital business card sellers they specifically DON’T sell their own NFC cards:
“HiHello does not supply or sell NFC tags, unlike several NFC-only business card providers. We do this for a reason—at HiHello, we don’t believe in charging customers an inflated price for something available at a minimal cost on third-party sites like Amazon and Etsy.”
Their app will write to the implant but doesn’t try to lock it down as far as I can tell. I didn’t even think about that part when I wrote the BC to my implant (NExT) but after reading this tried re-programming with another tool (my flipper0) and had no issues. So just figured I would mention it as an alternative.
Thank you for the guide to fixing the password issue with a flipper0. Bookmarked for future ref just in case 