Hi, I have google many times about this error. I haven't found any definitive answer about how to fix this stupid error permanently. So often, I can upload code smoothly for a long time, then out of the blue I get this error. I restarted the arduino, re-paired with the Mac, reboot the Mac.. Nothing …

Annoying avrdude: stk500_getsync error

ieee488 March 6, 2016, 3:25am 2

Try IDE 1.6.5
Try Linux

Topic		Replies	Views
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00 IDE 1.x	2	915	May 5, 2021
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00 IDE 1.x	3	1170	May 5, 2021
Error uploading on Mac: avrdude: stk500_getsync() attempt 10 of 10: not in sync: Avrdude, stk500, Bootloader issues	1	850	May 6, 2021
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Arduino UNO SMD Edition - avrdude: stk500_getsync(): not in sync: resp=0x30 IDE 1.x	5	1757	May 5, 2021