last week i updated my firmware to the 4.41.2 Rebug. After the update, i installed the new version of Multiman, 4.40.00, but at the first run the homebrew asked me if i would fix some games of my collection. After "the fix", GT5 doesn't boot anymore, XMB after the Polyphony logo. I erased all the data, but nothing changed.
(Sorry for my poor english.)