Getting Started/Help/Tutorials- Just bought your PSP and need some basic help using it or loading homebrew?
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opening_plugin.rco is not a background it's the file which contains the sound that your PSP plays when showing "Sony Computer Entertainment" when booting up your PSP (unless you have it disabled in custom firmware, of course).
and yes you can have custom backgrounds on FW1.5! pffft why couldn't you? Hang on birdman, you must have done a huge typo u should know that lol