I seem to remember something about downgrading to dingo requires 2 tries in a row. If unsuccessful you might try downloading the file again sometimes things get corrupted. Try searching the forum for downgrade to dingo. I wish I could be more help but I've not had to downgrade myself - maybe someone who has can chime in. I'm a little puzzled by the zip file disappearing - I don't remember that happening during my upgrade which went OK after Iused a fat usb. Luck
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