Okay, i have this wicked background picture that i set using 2.71 SE-C. This morning, i flashed the devhook config files and loaded 3.00 firmware with devhook. It all worked well and when i went back to 2.71 SE-C, my backgorund was gone (it is not flashed, just set) I set it and started a homebrew, finished with the homebrew and went back to the XMB. The background was gone again. I jave found that i can set the wallpaper but whenever i start a UMD/ISO/Homebrew it will disapear. Can someone please help me.
i had this problem once so i set the background through photo then went to settings\theme that give me the bsod and that fixed the problem,dunno if it will work for you it did for me
set your background through photo,then goto settings,then theme open it and it might give you a blue screen of death,it did for me and it fixed it on mine
