Many users jumped at the chance to install the leaked DK28 build of Android 2.2.1 for the Samsung Epic 4G this weekend, which is understandable considering how antsy all of the Galaxy S owners have been getting for Android 2.2.  If you did go ahead and install it, though, you may want to consider rolling back, because Sprint says that DK28 was simply a "test build."  Sprint did say that they're working on the official upgrade to Froyo for the Epic, but unfortunately, they're "unable to communicate a firm delivery date."  The full explanation from Sprint:

Sprint is working on a software package for the Samsung Epic4G that will upgrade it to the Froyo version of Android.  Over the weekend, some users were able to access and download a test build (DK28) for the Samsung Epic from some 3rd party developer sites.  Unfortunately, this is not approved software for Sprint production devices and we strongly recommend that users refrain from loading it.

Software version DI18 is the current production version of software.  When new versions of software are available, users will receive a notification from Google on their device stating that an upgrade is available for download and installation.  While we are unable to communicate a firm delivery date, rest assured that we are working on a software upgrade to Froyo and hope to have it out in the very near future.

Most of you Epic owners reported an improved experience all around after installing DK28, so I'm sure that hearing Sprint tell you to uninstall it is one of the last things that you want to hear.  Still, you remember that whole fiasco that EVO 4G owners had to endure after installing a build of Android 2.2 that was a little less than official?  Sure, they got caught up eventually, but since they installed a leaked update, they were stuck waiting longer for the official version of Froyo even longer than everyone else.  You really want to wait while all of your friends enjoy the Android 2.2 on their Epics, rubbing Froyo in your face?  Yeah, me neither.

Via Android Central, Sprint