Oh (x2) "Arduino Duexxx or Nano w/ATmega328"
Just to follow up . . .I was up to 4 "bad" chips - out of ~50.Using the same setup described in the 1st post, I did the same operation on another machine - same REL 22 installed.I was able to bootload and program all 4 of the "bad" chips.A mystery I'm not inclined to pursue, but just in case it happens to you or a loved one.
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