You might not be aware of it, but Sprint’s HTC EVO 4G boasts an 802.11n chip inside it, but it’s only capable of running at the slower 802.11g speeds. This is where the excellent hacking community chips in. If you’ve rooted your EVO 4G before this, you’ll be able to remove this limitation, apparently just by fiddling with two lines of code, which is pretty much just a copy/paste affair. The question is, why is the 802.11n Wi-Fi disabled on the EVO 4G, could it be due to battery concerns? Of course, do remember that you’re rooting your EVO 4G and fiddling with a hex editor at your own risk.
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