I found one solution for easy hack ofw by r2 mod...
Why i need this trick?
Coz when it unhack then i have to format whole stick which is 4 gb and after hack i have to transfer all games again....
What to do when psp unhack due some reason?
1. Download chickhen r2 mod2
2. Do system restore....
3. connect psp and delete egghut.bin file along with previous egg pics from root..(if they r hidden then unhide system folder first from pc)
4. Transfer downloaded chichken pic and files...
5. disconnect from pc then try to hack..
It will work for me after 1 times easily and i also not need to format my card now....
If this will also work for u then please let us know...