i start my psp, which is version 1.5. then, i go to game- memroy card- devhook 0.46 in the devhook, i choose - umd- sd gundam g gerenation and firmwire- 2.71 i return the the main menu, and choose start. my psp screen turn black, and the power light is on. nothing happens. did i do something wrong? if so can you please tell me.