Same thing happened to me. Factory reset the phone. Still nothing. I used Odin to flash the 2.3.4 files back, wifi works fine, then updated the phone to 2.3.6 again and wifi doesn't work again. I'm not sure what's going on but with the 2.3.6 update, my 3G speeds are hit or miss, either slow or fast, but not consistent, my 3G signal itself is horrible, and wifi doesn't work right. No matter how many times I reset the phone, factory reset it, or re-install the update, wi-fi still doesn't work right. I am trying to upload a video of it right now. It shows me turning the phone on, showing you it's running on 2.3.6, then performing a speed test on 3G, then turning on wifi, performing a speed test, then trying to open the internet browser, then another speed test, then google play, then another speed test, then maps and then a final speed test. The speed tests all work fine, but trying to use the wifi in an app doesn't work what so ever! This is ridiculous! Seriously contemplating about flashing it back to 2.3.4 and dealing with it until 5/31 and then buying the new HTC Evo 4G coming out for Boost! I'll post the video once it gets uploaded.
How, exactly, do you revert back to 2.3.4? I'm not a newbie, but I have never downgraded from an upgrade, so I don't really know how to do it.
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