I understand that 0xff is not a useful value, it was just to dramatize the error. So even if the write failed, the read should pass, but neither did.

Yes, I will try the svn version, thanks.

On 06/05/2012 03:30 PM, Joerg Wunsch wrote:
As David L. Martin wrote:

0.00savrdude: stk600_xprog_write_byte(): unknown memory "lock"
   ***failed;
That should be fixed in the SVN version.  Give it a try if you can.

Btw., trying to program the lock byte to 0xff is not useful.
Returning lock bits to `1' state can only be reached by means of a
chip erase.



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