Upgrading OpenBSD from 5.1 to 5.2

OpenBSD 5.1 -> 5.2 upgrade guide

1. Get 5.2′s bsd.rd from FTP and put it on /
2. Boot it by typing boot bsd.rd (on PC architectures only)
3. Select Upgrade
4. Follow the steps…
*When put location you can use disk or through internet, if it can't found the server just key in one more time the server name.
5. Reboot
6. Get etc52.tgz and xetc52.tgz
7. cd to that location and do
    sysmerge -s etc52.tgz -x xetc52.tgz
8. Follow the steps
9. Reboot
10. Welcome to the latest openBSD system.

ref : http://threebsd.wordpress.com/2012/11/03/openbsd-5-1-5-2-upgrade-guide/