Locking of any AVR or 89?

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We have various locking levels available in AVR as well as 89 series.
Particularly in AVR, some one told me and even demonstrated me to BREAK the lock to read the program.
I did not agree with his demo.
Any comments from the BIG bosses here...

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There are supposed to be erratta on a few specific AVR's that can reset the fuse bits if a high voltage pulse is sent through on the right pins under certain circumstances but they're not too reliable, and don't work on all chips.

-Curiosity may have killed the cat
-But that's why they have nine lives