As of recently, most US carries decided to start cracking down on people who use their data plan for tethering. They use a variety of methods such as monitoring the usage, capping data speeds, and many more. Now, it looks like Sprint decided to go down that route as well and thus, decided to lock the HotSpot app in the latest Sprint Official Rom for the EVO 4G. Well, needless to say that you can use other methods to tether, such as WiFi Tether, which is a free app that happens to be blocked from the market by various carriers. Another option would be to simply avoid the update altogether and use of one of the other fine custom roms that can be found in the EVO section. However, in case you are itching to see what Sprint did with this new update, you may want to check out this mod, presented by XDA member noimjosh. The mod supposedly unlocks the official app and allows you to tether either wirelessly or via USB. This has only been tested in deodexed roms so far, so for the time being, this is a requirement.
Please leave some feedback for the dev if you happen to test it in other roms.
I have only tested it on this ROM (DEODEXED), but it works.
You can find more information in the original thread.
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