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 Post subject: MMC Unlock codes
PostPosted: September 28th, 2009, 14:29 
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Joined: September 28th, 2009, 14:18
Posts: 2
Location: United Kingdom
Hi guys,

I have a lot of experience with forensic analysis but not much "under the hood data" recovery stuff unless you can count
dd_rescue. In my day job I see a lot of locked MMC cards from mobile handsets which are as a result impossible to image, I was
wondering .....

Is it possible to unlock an MMC card that has been locked by a mobile phone handset (i.e Nokia)
under the following conditions:

- without the password
- without losing the data
- possibly without the handset

I've read about MMC commands but as far as I could tell the only way to unlock the card without the password would result in
complete data loss.

I'm sure one of you chaps knows the answer.

Cheers

Andrew


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 Post subject: Re: MMC Unlock codes
PostPosted: September 29th, 2009, 3:31 
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Joined: January 8th, 2008, 5:21
Posts: 925
Location: uk
Reading the following thread will probably explain the state of play.......though I am not sure what you would find when you open the package to desolder the chip.

mmc-password-unlock-t7301.html

Doomer wrote:
They use standard MMC-command to unlock cards with the whole data erasing like Security Erase on HDD
If you need data - unsolder chip, read it on programmator and decode translator schema to get correct data or unsolder, find the password and reset it then solder it back


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 Post subject: Re: MMC Unlock codes
PostPosted: September 29th, 2009, 13:19 
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Joined: July 18th, 2006, 3:05
Posts: 7474
Location: ITALY
It is possible.


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 Post subject: Re: MMC Unlock codes
PostPosted: September 29th, 2009, 13:31 
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Joined: September 28th, 2009, 14:18
Posts: 2
Location: United Kingdom
Thanks for the replies,

Sounds like as I suspected the only option would be to de-solder these cards.

If I were to start experiment with de-soldering and reading the chips what gear would you guys recommend ?

I've seen some of the salvation data flash gear is it obscenely expensive ?

Thanks for your help so far.


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 Post subject: Re: MMC Unlock codes
PostPosted: September 29th, 2009, 15:07 
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Joined: July 18th, 2006, 3:05
Posts: 7474
Location: ITALY
Notice that :

1) not all MMC card can be opened physically (many are molded and/or use CSP)
2) assuming that the card can be opened, not all the chips/chipsets are supported by programmers
3) commercial tools for flash diagnostic / data access are NOT guaranteed to give you access to data, you still have to know some parameters or find by trial and error AND they cost a lot...
4) ... and many systems now do hard encrypt data before writing and decode it on the fly.


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