Bitmain Warranty fixed another R4 board for me, faster turnaround and worked well.

Kind of sad when one bad chip messes up the chain, but I suppose that's a tradeoff for the design. At least Denver has a faster turnaround and cheaper repair than going to China, plus no customs or international shipping madness. Much better.

Also patched the antbleed bug on my systems, hopefully that won't be an issue in the future either.