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#1 2017-09-21 19:46:13
- hph86
- Contributor
- Registered: 2017-09-19
- Posts: 3
Chinese Magic Card CUID/Gen2 recovery
Hi everyone,
I have ordered several magic cards (gen1 and gen2). For a gen2 CUID card I have screwed up the BCC of the 4-byte UID. That has bricked the card in a way that it does not show up in nfc-list anymore. However, I can still "talk" to the card. Thus, I am trying to patch my libnfc to make it ignore the wrong BCC.
Now my question: Does my endeavor make sense or isn't it possible to trick libnfc into authenticating to sector0 and re-writing a correct BCC? From the blog posts I have read so far, I can see that it seems to be a known/common problem, but I could not find a definitive answer if unbricking a CUID card is possible (and nobody impleneted it yet) or if it is impossible.
Best regards!
P.S.: I am currently working with an ACR122 on libnfc while my PM3 is in transit.
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#2 2017-09-22 17:17:06
- Dot.Com
- Contributor
- From: Hong Kong
- Registered: 2016-10-05
- Posts: 180
- Website
Re: Chinese Magic Card CUID/Gen2 recovery
Probably perma bricked. Even the chinese company who does it as no answers to it yet.
Until now I have not find a way to fix it yet. Probably no answer to it till date.
A bad access bits probably bricks it instantly. So to guys out there. Be warned about it.
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#3 2017-09-24 19:20:59
- hph86
- Contributor
- Registered: 2017-09-19
- Posts: 3
Re: Chinese Magic Card CUID/Gen2 recovery
Thanks for your reply! I will poke around some more with it and post my findings here
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#4 2017-09-25 10:00:44
- iceman
- Administrator
- Registered: 2013-04-25
- Posts: 9,538
- Website
Re: Chinese Magic Card CUID/Gen2 recovery
Haven't tried to "recover" a gen2, since its suppose to follow protocols quite well.
ie write a bad bcc and the readers will think its a bad card. Luckily PM3 has options, you use the hf 14a raw commands to make a custom anti-collision and but the mifare authentication part will be hard to get by.
We would need a "hf mf raw" command which does mifare classic protocol.
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