Well, I guess videos weren't enough.
I just grabbed "Official_WAB_Downgrader_ v0_1_9_for_PSP_1_5_2_0" from the net. Says it was leaked.
The icon and pic in the PBP are captured (and rather badly I might add) from the WAB video.
The file is 13 meg. I know the file size and checksums are around somewhere, but I'm guessing it's a 2.0 upgrade.
If I mangage to figure out exactly what it is I'll post that. I'm sure there are others who will let us know more quickly than I can.
ps. If someone let's me know how, I can post the icon1.png...