ISO‐14443‐A

MIFARE CLASSIC 1K

NTAG215

Writing content to the tag (URL/TEXT/WIFI/…)

1. Dump content to edit correct blocks via hf mfu dump --ns We only wanna look at the topmost blocks

0x00/0x01 - UID (Depending on if your tag is a magic card you could edit that but that is out of this scope)

From the last byte of 0x05 onward you can save any data.

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2. Now you can write content with hf mfu wrbl -b <block> -d <encoded data> First convert your data into hex (sunfx -> 73756e66782e6e6574). Now block that data into 4 bytes. In this example that would be hf mfu wrbl -b 5 -d 10550473 -> s Data before the 73 seems to be some metadata so dont edit that, but with that command your first letter has now been written to the tag. hf mfu wrbl -b 6 -d 756E6574 ->unfx and so on

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3. If theres somehow some data left or you need to delete something just wipe the block with hf mfu wrbl -b <block> -d 00000000

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4. You can also verify what you did with hf mfu rdbl -b <block>