Hi

i have a slim 2004 ta088 v1/v2 (02g) psp. i had 5.55 gen then i updated to ofw 6.2 succesfully. but now i cant install 6.20 Pro B9. everytime i install it erverything says ok but if i restart it it goes blacksreen and then it crashes. but i can start the psp its only not on cfw.

hope someone can help me.