Yes, go for the 3.55 kmeaw.
Have you gotten any savegames or important files so far?
If yes, I recommend you to back them up.
(Just on a USB stick or so.)
I had bad-luck and needed to format my HDD in order to use my PS3 after I installed 3.55 kmeaw.
What's your favorite team?
Originally Posted by grant01
If you want to sort your PSN games alphabetically, feel free to read my guide:
(Should also work for Signed PS3 PKGs!)