psp5.51 'ISO游戏玩不了

升完5.51系统后,ISO游戏玩不了了,显示没有游戏
能提供一个降级工具吗

is it is't 的区别 Why is elephant's nose is too long? the car which is repairing is ton's Nothing is serious，is it/isn't it ？？？ What is 'Epipsychidion'? Who is Twins' boyfriend? love is understanding;love is sacrifice;love is sensation,love is acceptance in all one's life. I don't think he is to blame,is he? 为什么用is he? Marry ' best friend is funnier than she is .为什么末尾用she is 啊什么原理啊？ 翻译Who is the our's mother? It is the motherland. It is she that givesus the happy lift