
There are reports of a ROM change that can be made in a Treo 650 to get the kinds of blazing speed that is promised with the Treo 700p, and by a "simple" replacement of two .prc files in the ROM.
I won't even try to evaluate the practicality, risks or benefits of this maneuver, but if you are really adventurous you can look at
this thread from TreoCentral to more information on what they are calling "Fast-mode Blazer for 650!" Whether or not that includes EVDO, I can't tell, but the idea is certainly interesting.
Via
Palm Addicts.