Upgrading from FreeBSD 5.3 to 6.2

[Jose-Marcio Martins da Cruz]

Ralph,

I found Ralph Engelschall scripts to upgrade FreeBSD systems.

http://people.freebsd.org/~rse/upgrade/freebsd-upgrade-5x-6x.txt

But there's a line saying :

****
The following is a step-by-step procedure for upgrading a server from
FreeBSD 5.[45]-STABLE to a FreeBSD 6.2-STABLE.
****

Probably this line tell me that I can't use it to upgrade from 5.3 to 
6.2. If I'm write, what can I do and how to modify it to upgrade a 5.3 
box ? Any other suggestion ???