Arduino Unor R3 avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

Development Tools Uploading
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Sketch uses 4410 bytes (13%) of program storage space. Maximum is 32256 bytes.
Global variables use 256 bytes (12%) of dynamic memory, leaving 1792 bytes for local variables. Maximum is 2048 bytes.
"C:\Users\mentz\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\mentz\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-PCOM5" -b115200 -D "-Uflash:w:C:\Users\mentz\AppData\Local\arduino\sketches\F88F1AC70125E74A35D8E8CCEE34D97F/sketch_dec17a.ino.hex:i"

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Users\mentz\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"

         Using Port                    : COM5
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

avrdude done.  Thank you.

Failed uploading: uploading error: exit status 1
Uploading to UNO R3 fails: "exit status 1"
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@magnus2508 please do not hijack topics. Although your symptoms might be the same the root cause might not be the same.

  1. Are you indeed using an Arduino Uno R3 (or clone of it)? Or are you using another Aruino Uno (e.g. WiFi rev2, Uno R4...)?
    • In case of a clone, what is the serial-to-usb converter on the board?
    • Did you install the drivers (if needed)?
  2. Does COM5 disappear from the IDE (and from Windows device manager) if you disconnect the board?
  3. Which version of the IDE are you using?
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