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  • That gave me a brief glimmer of hope, but I've made that change and it hasn't worked. I've tried a couple of different AT84's and Nanos. Commented Nov 9, 2020 at 20:55
  • If you watch carefully do you see the L light blink in the way that it does during a reset? In other words, is your RESET holdup-cap actually doing its job? Commented Nov 9, 2020 at 21:02
  • Yes the L light is blinking when I attempt to upload the sketch. Commented Nov 10, 2020 at 2:27
  • Yeah, it would as being SCK. What I'm getting at is that it will blink three times on a reset. If it's doing that particular thing when you're trying to upload, it means the cap is not keeping reset from going low. Commented Nov 10, 2020 at 2:29
  • I don't understand what you mean. I took the capacitor out and tried again. The blinking seems to be the same regardless if the Cap is in or out. I tried a different capacitor. Same result. Commented Nov 10, 2020 at 2:33