Hi. Is there some Magic mifare ultralight implant Where i can change the uid?
Not really… there are magic chips that do exist for this but they are rare, require a proxmark3 to do anything with, and they are expensive as all heck.
I might consider making a flex version but it would have to be presale… and again, the cards that have these chips in them are galldangitall expensive as hexkeroo
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Ok, I understand it was just for fun if I could clone a key card for a Cabin on a Boat
Honestly, I would get it if ever becomes available. It could work with hotel keys (because I don’t really want to ask to enroll my chip into their system) and some other things such as tickets.