thanks a bunch, my f50bt kept on rebooting, and this fixed the problem. great guide.
couple of things that took me some time to figure out, hope it saves some ppl some time.
on the bootup screen of wince i coudln't reach the edit copy, so i had to use the keyboard control C+ and control + V
to copy and paste the files.
as someone said before, don't unzip the data.zip file, just upload it.
my other mistake was puting all the files of bootloader on to the sd card, when you should have a folder directory with all the files inside it, instead of having all the files on the sdcar