you dont have to upgrade if you dont feel like it but its mostly better to do it because those firmwares you see like 3.90m33 get you more addons
you can play old games via emulators, add hombrew, play psp games through the memory card, you can play PS1 games, and other cool stuff.
but be sure to install the 1.50 kernel after updating it gives you the ability to use hombrew that requires the 1.50 kernel
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