I was about to upload that.Humma Kavula made a bootable iso image to test out his "Fastloader 0.7" back in the day...here is the iso (NOT A PIRATED GAME, A SIMPLE DEMO ISO MADE BY A FORMER PSP DEV IS ALL IT IS)
Humma Kavula's DEMO ISO Download
The file in PSP_GAME/SYSDIR/BOOT.BIN is not an eboot, my guess is it is just the elf.
At least it's a good demo, better than nothing, and been around for about a year.
So what is a dummy ISO? Really, why does anyone want it?
There's no proof that it was made without Sony tools.