I also downgraded my PSP a little while ago.
I haven’t had the bottle to install custom firmware yet, I’m too afraid I’ll brick my PSP (it was scary enough downgrading, yet alone playing about unnecessarily with flash). If you don’t know for sure what your doing (and I certainly don’t)... don’t do it!
With custom firmwares you can have fancy boot screens with differnt sounds and pics, different fonts, pictures for your wallpaper etc etc
I can live with a standard 1.5 PSP.
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