You would only want to upgrade if you desperately wanted some of the new features in the update such as web browser, rss feeds, location free player, wma support and such. Also some newer umd games require at least 2.0 firmware. If you upgrade you will lose your iso ability. Also with firmware 2.1 - 2.6 you would have to use the GTA exploit to run homebrew apps which also you will only be able to run a small percentage of those apps at this point.
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