This is exactly why I love Android so much and the awesome developer community around it. Case in point: the official Android 2.2 update for the EVO 4G has already been rooted by netarchy over at XDA-Devs. Yea – the update that was just released yesterday… pretty impressive stuff. Be forewarned, though – the update may not play nice with the previous (non-final) update that was released.
You might be able to just flash this over the leaked ota, but I advise doing a full wipe before flashing just to be safe.
f11ac5b0cc1548c722f8df32440a312a - HTC-OTA-3.26.651.6-Final-Froyo-Rooted-Odexed-netarchy-signed.zip
a3d42bf93dce2977748b90d5084d1b44 - Wimax26023.zip
85c7f0e31c66c80397dcc3cece0f5c76 - Radio-2.15.00.07.28.zip
And the updated radios:
Flash these radios one at a time in recovery, you will have to reboot once for each one.