How to install PSP 3004 CFW in firmware 6.31?

i recently purchaseda new psp 3004 wit 6.10 firmware in it ... i have upgraded it with 6.31 to play SIGNED games .... i need to install a custom firmware in it , but when i read the blogs to crack the firmware ... they even mentioned you need to have a specific board so use this down-grader upto 9g ... well i installed a PSPident to check my board but this not working ....i am in great urge to play SMACK-DOWN VS RAW 2011 and many more .... i'll be great ful if sum-1 tell me the step by step to install a cfw .... i came across many pages but i am scared to install cfw hope it may not BRICK my psp ..and even tell me which is the best CFW to play all 2010 games