https://forum.arduino.cc/t/avrdude-programmer-is-not-responding-stk500_getsync-not-in-sync/549818
avrdude: programmer is not responding & stk500_getsync() not in sync - Uploading - Arduino Forum
Oct 7, 2018 - Hello, I'm trying to use an Arduino Nano (first time) with Windows 10. When trying to upload a sketch (also for the first time with this board), I chose the...
https://forum.arduino.cc/t/find-and-fix-the-stk500_getsync-not-in-sync-resp-0x00-problem/70436
Find and fix the stk500_getsync(): not in sync: resp=0x00 problem - Suggestions for the Arduino...
Sep 1, 2011 - I see many posts where people have encountered this message avrdude: stk500_getsync(): not in sync: resp=0x00 stk500_disable: protocol error, expect=0x14,...