I found out the method to get in the bootloader by trial and error using the fact that the rocker is used on the upgrade for the viewsonic. Why do you want to upgrade via SD? I want to know how and try it to see if it can be done in case I mess up the unit and I can't do it via activesync. I have been playing around with the xda rom tools hoping something there would help. I have been able to do what appears back up the rom as a nb1 file but I can't open it in their tools to see it. Nb1 is the format that xda uses. The viewsonic used .bin and then this one POG. I wish we could find out more about pog? ARe you in Ontario..I thought I saw a york university email associated with one of your posts. I'm from Ontario and work in Mississauga. Do you know any more posting sites that have info or people that have ppc 4100? I know mpx200.org has posting. We need to get whatever information we can.