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According to ISO/IEC 7816, there are no 6DXX code except for XX=00, but 6D04 is what I'm getting. Does anyone know or is there a more up-to-date version available?

I don't think, it can be something like "Instruction code not supported or invalid" as the commands seems to be valid: When executing AB, then A returns 9000 and B returns 6D04. When executing BA, then B returns 9000 and A returns 6D04.

There may be anything wrong... :(

maaartinus
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    No, the 2013 version of ISO 7816-4 still has no other 6D combination, so I would consider 6D04 as non-standard. What does the manual of the operating system of the card you use suggest? – guidot Apr 24 '17 at 06:50

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