Got my R909 delivered today and got all my miners going except the R808 I got off of ebay appears to have pooped out. It was working then got stuck on Found 0 Chips..
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Check it's not a software version issue - i.e. if it was working before, use the version of software from before just for the R808 and see if it's ok.
I've no idea if the R808 works with the current code.