Google has confirmed that a software issue is to blame for the HTC EVO 4G LTE and its Google Wallet woes. Previously we reported that many users were experiencing a problem where the app was said to be unsupported or in an unsupported country, and Google says this is all caused by a software issue on the phone itself. While there was no mention of when to expect a fix, Google assures that it's fixable in software, and is working with HTC and Sprint to rectify the issues. This all hashes up pretty well with Google Wallet Support's previous statements, and we hope to see a fix come out soon.
Source: The Verge