Nesterj v.07 on psps not working

[psptovista1]

hey i need help on installing nesterj on my slim psp. whenever i select it it says "The game cannot be started. Data is corrupted" can anyone help me?:(

[SSaxdude]

If you are not running a custom firmware or firmware 1.5 then you cannot do any hacks/homebrew whatsoever. This guide shows you how to use Pandora's battery and downgrade: http://www.psp-hacks.com/forums/viewtopic.php?id=119947
You will still need to have a homebrew-compatible PSP to create Pandora's battery.

[Wally]

For a start, NesterJ .07 is old.. Stick with .11 or higher.

What firmware are you running BTW?