暂时没有办法,国外的黑客也遇到同样的案例
So far there are many reasons why old secdata is overwritten. Usually there is large DASH update and some games like fifa10 or assassin creed 2 (for example) writes many changes to NAND filesystem. Only on two images there was something really strange like temporary regional settings, but it's really strange that was written to the filesystem.
更新是导致旧的secdata被覆盖的最主要原因,但也有极少见的因为修改区域设定而造成的覆盖。