first of all, you dont need devhook, you run the games straight from the game menu in the xmb.
devhook is old skooool, (although very useful in its time)
and, if you are going to download the hot shots golf iso(LEGALLY, [no warez here buddy]) put it in the iso folder found in the root of your memstick.
how to use the firmware to its full potential? well theres lots of things you can do, like, custom themes, icons, backgrounds, battery bars, volume bars, gameboots, emulators, overclocking, and alot more.
just go ahead and read around, you're sure to discover everything by yourself.
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