Sounds like you bricked your psp. All you need to do to install a new theme is to put the .ptf file in PSP/THEMES.
Of course if you used a particularly old theme that was made for firmware 1.50, there would be a good chance you would brick your psp.
So....why did you "delete a vsh folder of flash0" and how??? The only way you could delete anything from flash0 is on the psp itself any you can't back it up. At least as far as I know.
Perhaps you mean VSH.txt form the directory seplugins?
Bookmarks