This has happened to me before, a number of times, so I'm not sure it's strictly a 1.7 issue.
But if you want to go to a previous version, the procedure is the same as for the "latest.zip" that you just installed, except you do it with one of the previous packages available at iRex's firmware repository. I don't have the link handy but it's in the first post of the sticky thread "Feature Requests etc.".
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