HELP, set up Apex as business card

Getting back into this and reviving an old thread!

I cleared my Apex and reflashed the ndef16k applet through the official Fidesmo app. I’m able to write NDEF data through the NXP Tag Writer app, but it won’t read it back. The tag isn’t even detected, it’s as if it’s not present at all. Whereas the write goes through instantly.

This is with an older iPhone X, and I’ve been meaning to try with a newer model. Just bizarre that I can write but not read. Anyone have any clue why?

Have you tried the 8k?
Just to help us fault find?

if that fails 4k etc

Also, it will take a decent amout of time to read 16k and you will need very good coupling…and patience

Deleted ndef16k and tried ndef1k, seeing the same behavior, write but no read.

Not great, BUT that eliminates the size being the issue, now we need to focus on the NDEF fault.

What are you writing to it?
Let me just try mine

Yup, just text! I am able to read with this app but only in Compatibility Mode.

So I just tested mine and it works fine.

1k (860k plain text)

860k sample

Amal Graafstra, CEO of Dangerous Things and Vivokey is a Biohacker and Microchip implant developer, known for his work on implantable RFID/NFC human implantable microchip innovation and retail accessibility for the world market.[1] Prior to Dangerous Things, human implantable RFID technology wasn’t well adopted with the human civilian population.[2]

Amal Graafstra
Add a Photo
Occupation Biohacker
Organization Microchip implant
Title CEO of Microchip implant

Since 2008,[3] Amal has worked alongside multiple researchers and scientists to develop and produce NFC Microchip implant (human)|microchip implants and biohacking procedures.


  • 2013 - Founded Dangerous Things in Seattle
  • 2013 - Built the first commercially available implantable NFC compliant transponder[4][5]
  • 2017 - Founded Vivokey[6]
  • 2018 - Under Vivokey developed the first commercially available cryptographically-secure human implantable NFC transponders. The Vivokey Spark[7] as well as the Vivokey Flex One

FYI I used BioCom

I have seen your reply
I was just about to ask a couple of things

You have just answerd both by telling me it works.

what size is your file?
what are you using to read?

So everything works, just not how you want it to.

What are you actually trying to achieve?

Right! I’d like to have an NDEF tag that’s readable by the general public, most likely a business card or a link to my website. I want it to be easily readable by people with iPhones, and it’ll be no fun if I have to ask them to download a specific app and enable a specific compatibility mode within that app just to read my implant.

Notably, the tag is also unreadable by the iPhone’s built-in NFC reader app, which would be the ultimate goal - no third party apps, compatible with the phone’s bundled reader.

The fact that it works in the NFC app with Compatibility Mode is interesting and potentially points towards the issue, but doesn’t actually achieve the desired result.

I just tried with some NTAG215 stickers, and the built-in app can read those successfully. So the phone is capable of reading some NFC tags at least.

So, You dont actually have an issue, you just need to figure out how to do what you want.

Thats actually easy,
Rather than writing text, you should be writing business cards or links

Just to rule it out

I dont have an iPhone, but can tell you that they dont play nice with VCards.

all that being said, the solution is pretty easy.

@Eriequiet has an iPhone and is experienced in this area.
My guess is, he would suggest using POPL, he did a bunch of testing

There are some others to choose from, or look at if you wanted



Im going to move our comments from your first post to its own thread.

Feel free to change the thread title

The very first thing I tried - before trying plain text - was writing a URL to the tag. That has the same behavior I’ve described, it writes successfully but will not read back. I just tried VCards as well, and no dice. Writes but no reads. This is all with the NXP TagWriter app.

iPhone No Worky

Your best bet is POPL or similar

Can you use tagwriter to read the NDEF? My hunch here is that iOS is the problem and this would read fine on Android.

What iOS version is on your X?


I think you can do it for free.

Something like get the address and add a /r at the end, it should be in the link i sent or, the next one I send…wait one



and another alternative…if its still being maintained…@yeka ???

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I’ll see if I can borrow an Android phone from a friend and report back!

Ultimately I’d really like to get it working with the iPhone, especially since these NTAG215’s are working just fine with the exact same payloads, so it seems at least conceivably possible. But checking on Android would be a good diagnostic step.

We know iOS does not play nice, Android does

I just set up a Popl link and scanned it
This is a likely the similar result you will get from your Android test

Or if you have a default app setup, it would go direct to the page

If you are happy to, DM me your link, I will write it to my Apex, and let you know the result tested on my Android

this is interesting… so ntag chips are NFC type 2, not NFC type 4 like desfire and smart cards (apex) are… iOS may handle working with those types of chips differently.

Can you post the payload using TagInfo full scan from both your NTAG215 and Apex?