I would like to add that by following the direction that are packaged with the device, you will brick your SheevaPlug most effectively. What a piece of junk. As long as people expect nothing for customer service from this vendor they will get nothing as well. I really wish this product came with a disclaimer that indicated that it will in no way be support, be expected to work or be friendly in anyway possible.
I for one have followed the instructions that come with the Sheevaplug and they have worked correctly for me.
It is impossible to brick the SheevaPlug via flashing it. It is always possible to reflash it if you make a mistake.
Hence:
A:) You are either a troll.
or
B). You need to take basic reading comprehension and literacy classes before attempting to read instructions more complicated than how to tie shoe laces.