For my reference only :
1. http://forums.maxconsole.net/showthread.php?t=19016
2. http://www.fanjita.org/
3. http://forums.psphacks.net/index.php/topic,13528.0.html
4. http://www.hackaday.com/entry/1234000687060851/ (downgrade from v2.0 to v1.5)
Thanks to Bobci.
p/s : PSP + N70 = N80/SE P990i (that means, no N80/SE P990i if i buy PSP)
:P
