So I originally had 5.50 GEN-D2, was installed, and I could play many games fine and load all savedata.
When 5.50 GEN-D3 came out, I did the following (Like I always do):
1.) Format Memory Stick.
2.) Remove Memory Stick.
3.) Remove UMD.
4.) Restore Device Defaults. -> Restart (Skip all configuration at startup.)
5.) Download the update. Place on memory stick.
6.) Insert Memory Stick.
7.) Insert AC.
8.) Run it and update.
9.) Repeat Steps 1,2,4 and 6.
Once I did that I went to bed. Next day I saw that an update has been released.
So I did the same again. Steps 1 -9.
I then moved my ISOS and savedata from PC (when I had GEN-D2) back on memstick.
Turns out all savedata became corrupted.
(I still have backuped savedata from GEN-D2 on PC.)
I'm certain it must be the CFW problem.
I heard that using the GEN-D2 Updater and going back to GEN-D2 will work again, but I would like to play these newer games.
And I have searched the forums.
Any ideas guys?