Hello everyone I need some help :( I appreciate your help in advance

I have a 2001 psp with cfw version 5.50 GEN-D3 and suddenly when I enter into usb mode I can't access any of my files , all my folders (ISO , PSP, etc) are 1 kb and have a direct access symbol in their folder icons.

I have in my ISO folder the game dissidia final fantasy which I can still play.
I can still view my game save files while in the XMB bar when I turn on the psp.
But I can no longer add games to my ISO folder , Music etc. for example :(

I would like to add that my psp hasn't been able to properly turn off for some months , even if I hold the button to turn it off it just goes to sleep , so everytime I turn my psp ''on'' It ''awakes'' :P this has happened since a maybe stupid friend got into recovery mode with my psp or something like that when I wasn't watching and I don't know exactly what he did then.

sadly I don't have any backup savedata of my game saves in my computer.

Am I screwed now ?

Can I do something to get my psp to work well in usb mode again by being able to view and edit files ?