Although HTC hasn't released an official statement about this, the company has said via Twitter that it was working on a way to get anyone who applied the unofficial Android 2.2 update (version 3.26.651.3) to their HTC EVO over the weekend back on track.
While we're still waiting to see what happens next, G&E reader Earl wrote in to share an email he got from HTC in answer to his question about being able to apply the official OTA (version 3.26.651.6) that was released on Monday.
I understand how frustrating it is for you trying to perform the "official" over the air update to your Sprint EVO by HTC. However, Sprint has requested that we send customers to a Sprint service center. There they will roll the software back to software 1.47.x.x and the FOTA will work from there.
To send a reply to this message or let me know I have successfully answered your question log in to our ContactUs site using your email address and your ticket number [blocked out for privacy].
Anyone else get a similar "solution" from HTC or Sprint?