hi guys . i've been searching google and all other psp mods forums , but couldnt find a way to do this . i have a 3.10 oe-a and i wanna upgrade to 3.40 cuz i've just downloaded transformers the game ( i need 3.40 for this rite ? ) so , first i tried searching 3.10 oe-a > 3.40 ... nuthing came out . then i tried 3.10 oe-a to 1.50 to 3.40 . it is possible rite ? do i use this method ? http://ubergaming.wordpress.com/2007/07/02/psp-firmware-340-oe-a-upgradeinstall-guide/ plz . can someone help me . thanks !