If it really is bricked then you can jtag it. There was a post about this a couple of days ago. Use the search function.
The easiest way to avoid buying lemons is to buy only from trusted sources. Also, it is NOT a good idea to continually re-flash boxes, as every re-flash has a chance of destroying the box. That's why I always say, if you're happy with what you've got, then leave well alone.