EPSILON5 by your description sound like someone selling for good money what you can get for free from Atmel.

I suggest that you diacard the EPSILON5 and read up on ISP and FLIP from Atmel. I have no doubt that Atmel know a bit more about their chips than Epsilon.

For "the final solution" search and find the version of NoTouch that someone posted for Atmel and add that to your code. Then updating the program is only a matter of plugging a cable in and entering a command (No PSEN low ALE High or whatever needed). Since I have to state this so often in a later post, let me be proactive: NoTouch only works once is is loaded using 'regular' ISP means.

Erik