Root and flash 4.1.2.
Root instructions can be found here.
Once rooted you can use the rootkit to flash 4.1.2 and unroot.
It's not as bad as it sounds and you have a forum full of friendly people willing to help if something goes wrong.
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Once I had a Nokia 6015i, but it wasn't smart enough.
Then I had a Helio Ocean, but Helio went adrift.
Then I had a Palm Pre, but that ended PREmaturely.
Then I had an HTC Evo 4G, and we had a grand times!
Now I have an HTC Evo 4G LTE, and all is right with the world.
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