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Sprint announced this morning that it will begin rolling out an over-the-air update on June 6 to deliver the latest software release. As usual, the update will come in batches and users will receive a notification on their smartphones to let them know when the update is ready for download.
However, if you simply can't wait, there will be a manual download option starting June 3, where you can access the update by going to the Menu option on the Evo 4G and then selecting Settings > System updates > HTC software update. You can find more details and instructions on Sprint's Community site.
In addition to upgrading the Evo 4G to Gingerbread, the software update also restores the smartphone's ability to sync multiple Gmail accounts, display e-mail attachments, and it fixes battery discharge issues.