Proxmark 3 How to delete NDEF or Clear it?

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1

I have been at this all morning. Everything is working as it should BUT, I wrote a bad file to a MiFare card and now it’s erroring on my phone. I can read it with my proxmark but I can’t for the life of me figure out how to delete or clear that block. I’ve read every cheat sheet I can find and used the help command and I can’t figure it out. Help? Anyone?

*I have xSIID implant but I’m doing all my testing and learning on a keyfob
*ndefread is showing the info I wrote to the card as the payload
*hf mf wipe gives me an error about a hf-mf-*****-key.bin file not found

2

Figured it out!

First had to “hf mf fchk --dump” to create the missing “.bin” file which also contains the necessary codes for it to be recognized by a reader (I Think) . Then had to “hf mf dump” to add the payload to the “.bin” file. THEN I was able to “hf mf wipe” and erase all the contents. I was then able to format the card using NFC Tools and it is now back to factory defaults. This makes me feel a lot better about writing to the implant. Knowing I have figured out to clear corrupt data from the chip.

Side note, I wrote the corrupt data to the card by accident trying to figure out how to store an entire vCard on it instead of a link to a website housing a vCard.

Still haven’t figure out how to do that, but now I know how to fix it when I screw it up again.

3

hf mf wipe certainly won’t have done it since those are mifare classic commands and your xsiid is a mifare ultralight

4

I haven’t even started messing with the implant. All my testing (learning really) is being done on key fobs and cards. I’m still pretty swollen so I can’t consistently communicate with the implant anyway. I just want to know everything I can learn about programming these before I start messing with the implant. I’ve always learned best by breaking stuff, just don’t want to break anything I have to cut out of myself.

5

ok the command set youre goingto want to be using is hf mfu as those are the commands for mf ultralight as opposed to hf mf which are mifare classic commands

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6

Awwww man! Thanks so much! I was literally looking for this info as you responded! This will make it much easier to find a “commands cheat sheet”.

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