need help with Nesterj for PSP

[dday35]

Updated my psp to 2.0 and added a web browser awhile ago, then I downloader the downgrader to 1.5. Put nesterj on the psp and attempted to open it. It said the files were corrupted and the games couldn't start.
Did i do something wrong? Can anyone help? Also when I go into my photo menu on the psp it shows that I have no digital images and then my psp freezes for a few seconds and then crashes. The umd games still play fine.
Can anyone offer any help?

[jackthepumpkinking]

soz bud.having the same trouble.how do you downgrade the psp