To Answer questions.
NO need to do a backup.. All Unrevoked.apk does is actually grant the "superuser" access.. You will not lose any data AT ALL. All it does is unroot, does nothing else to allow you to load custom roms, etc.. just ROOT.
No need to run any commands, commandline, etc..
Just run the unrevoked.apk from your sd card after you copy it to there (on your phone), uplug from the computer, and make sure you check mark "allow non-market apps" or something like that.
Trust me.. will not brick, kill, or do anything stupid to your phone. You will have the Stock Sprint roms, programs, etc,, just ability to root, AND the free Wi-Fi tether link posted by the OP does work, and is FREE,,, (works great!)
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