PS3ITA CFW v1.1 Changes include the following, to quote roughly translated:
Changed one patch.
Fixed error 80028f17 (All PSX games downloaded from the store now work!)
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For those who have been following my problem of being endlessly in a firmware update loop, Just formatted the HDD after putting it in a PC, Now it works fine. So, if someone else gets into this problem, thats how you fix it!
Edit: Hm, Tried to connect and browse the internet, Now it says "An error has occoured : 80010102"
So...all this firmware did for me was add the /app/home option to the XMB, and disable my internet connection for browsing the net.