Hi,
a full tutorial would ask a bit too much energy. But basically, this is how I made it working.
I installed the kingroach ndure softmod on the disk, so that my xbox boots into the unleashx dashboard.
I start the PBL as an application in my dashboard. It loads a debug BFM bios that starts the debug SDK.
I had to disable the shadowc before I copied the debug dash files to the C partition.
I had to make the Shadowc.img file smaller on the C partition and I had to remove the filler files to get room for the debug dash files.
The Kingroach Ndure package had placed a backup unleash x dashboard on my E drive with a lot of usefull tools. That folder already contains a PBL version and a boot.fg file with usefull information.
I got confirmation that the method works on a 1.6 xbox as well.
regards.