PSN is expecting a different response from a new ps3-updatelist.txt file - it now has three lines instead of two. I tried changing the 2.3 to 0.0, and ImageVersion to 00000000, but the CDN link we have to www.ps3news.com will need to be updated, too. Kind hint to Made Man to raise the help flag!
Even then, I think this will have to be tweaked. Please help soon, oh great gurus of the PS3!
Below is the new file from