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Posts: 2,220 | Thanked: 3,778 times | Joined on Jun 2010 @ Florida
I'm not sure if this helps for 770 (I only got into these devices with the N900), but on the N900, you can run:
cat /dev/mdt1 | grep -A13 lock_code
And this prints out the part of the CAL area that contains the lock code hash. Then you can decrypt it using John the Ripper or something in a matter of minutes. I believe on the earlier devices, the lock code might not even be hashed, simply stored in plain text, but I'm not sure.

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