This has always worked for me. All the instructions are linked here. Notice that to minimize potential issues you will need a 32 bit Windows or Linux box. Also bear in mind that there are 3 different flashers. One for Windows, one for Debian-like Linux systems (like Ubuntu), and another one for different Linux systems.

http://talk.maemo.org/showpost.php?p...84&postcount=2

In the instructions above I was using the PR1.3.1 combined image, but you should probably just flash the PR1.3 image from vandys in the first post, then update to PR1.3.1 using Application Manager.

Also, if you need to flash combined and vanilla, some people report best results by flashing combined, then vanilla, and then combined (again).