I flashed my ECU with the DirectFlash tool many times when I got the s/c installed. It failed a few times and went into recovery mode and it loaded the stock file just fine. After many tries we figured out that ESS gave me an older file that was already on my car. So to answer your question if the DF tool kicks into recovery mode don't panic (like I did the first time!). It will put back your original file just fine.
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