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Dump content to edit correct blocks via
hf mfu dump --nsWe 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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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.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 -
If theres somehow some data left or you need to delete something just wipe the block with
hf mfu wrbl -b <block> -d 00000000 -
You can also verify what you did with
hf mfu rdbl -b <block>
