When using the NFC Magic app to write to a NFC magic tag (gen 1a), it does not correctly duplicate the SAK value if the value is inconsistent with Block 0 on the original fob.
After reading up some more, this might be a limitation of the Magic tag itself (where it will just show the SAK value as whatever the Block 0 value is set to). Closing.
Describe the bug.
When using the NFC Magic app to write to a NFC magic tag (gen 1a), it does not correctly duplicate the SAK value if the value is inconsistent with Block 0 on the original fob.
.nfc file from Original fob:
We can see a SAK value of
08
, and in Block 0 we see a SAK value of88
on the Original fob.nfc file from Magic fob (before copy, for reference):
The Magic fob in its default state has a SAK value of
08
and a Block 0 SAK value of08
.nfc file from Magic fob (after copy):
After using the NFC Magic app to clone the Original tag to the Magic tag, it has a SAK value of
88
and a Block 0 SAK value of88
When writing to the Magic tag, it should exactly duplicate the original tag with the inconsistent SAK value of
08
and88
Reproduction
Target
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Logs
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Anything else?
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