If it's the same as the Treo 600, do a soft reset (Push the pin in the back) while holding the top left button (Turnes wireless mode on and off). It should pop up with a message asking if you want to erase all data.
No problem. Glad to see it worked, I had a very hard time searching for that very thing months ago when I got my T600. Nice to know I won't have to search again when I get my 650 in a couple days.
Why did you want to reformat? To clear it for sale or to remove an offending program?
If you are trying to remove an offending program -- you will get it back if you re-sync with the same user id. Rename your back up folder to backup_old, before you resync if you want a clean machine.
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