Hi I'm getting this error message when I try to upload a sketch to my Uno R3. Any idea what the problem could be? Arduino: 1.8.19 (Windows 7), Board: "Arduino Uno" C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\User\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=2A03_0043 -ide-version=10819 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_802863 -warnings=none -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_500453 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\User\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=2A03_0043 -ide-version=10819 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_802863 -warnings=none -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_500453 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino Using board 'uno' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Using core 'arduino' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Detecting libraries used... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o nul Generating function prototypes... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\preproc\\ctags_target_for_gcc_minus_e.cpp" "C:\\Program Files (x86)\\Arduino\\tools-builder\\ctags\\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\preproc\\ctags_target_for_gcc_minus_e.cpp" Compiling sketch... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp.o" Compiling libraries... Compiling core... Using precompiled core: C:\Users\User\AppData\Local\Temp\arduino_cache_500453\core\core_arduino_avr_uno_0c812875ac70eb4a9b385d8fb077f54c.a Linking everything together... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-gcc" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp.o" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/..\\arduino_cache_500453\\core\\core_arduino_avr_uno_0c812875ac70eb4a9b385d8fb077f54c.a" "-LC:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863" -lm "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.eep" "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -R .eeprom "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.hex" "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-size" -A "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" Sketch uses 924 bytes (2%) of program storage space. Maximum is 32256 bytes. Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes. C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM13 -b115200 -D -Uflash:w:C:\Users\User\AppData\Local\Temp\arduino_build_802863/Blink.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:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" Using Port : COM13 Using Programmer : arduino Overriding Baud Rate : 115200 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xdb avrdude done. Thank you. Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions. Thanks

did you go there as it told you? [image] evatech: See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.

[image] evatech: Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions. Did you have a look at the help provided in the link at the end of the process? Is your UNO connected via a USB cable - you don't say :wink: Is it a known working power + data USB cable? Is there any indication that there is power on your UNO board? Does device manager indicate your UNO is on COM13? Has your UNO uploaded successfully before?

Hi I have an Uno R3 that I'm trying to upload sketches to but I get this error every time. Any idea what could be the problem? Thanks! Arduino: 1.8.19 (Windows 7), Board: "Arduino Uno" C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\User\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=2A03_0043 -ide-version=10819 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_802863 -warnings=none -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_500453 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\User\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=2A03_0043 -ide-version=10819 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_802863 -warnings=none -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_500453 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino Using board 'uno' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Using core 'arduino' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Detecting libraries used... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o nul Generating function prototypes... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\preproc\\ctags_target_for_gcc_minus_e.cpp" "C:\\Program Files (x86)\\Arduino\\tools-builder\\ctags\\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\preproc\\ctags_target_for_gcc_minus_e.cpp" Compiling sketch... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp" -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp.o" Compiling libraries... Compiling core... Using precompiled core: C:\Users\User\AppData\Local\Temp\arduino_cache_500453\core\core_arduino_avr_uno_0c812875ac70eb4a9b385d8fb077f54c.a Linking everything together... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-gcc" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863\\sketch\\Blink.ino.cpp.o" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/..\\arduino_cache_500453\\core\\core_arduino_avr_uno_0c812875ac70eb4a9b385d8fb077f54c.a" "-LC:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863" -lm "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.eep" "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-objcopy" -O ihex -R .eeprom "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.hex" "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-size" -A "C:\\Users\\User\\AppData\\Local\\Temp\\arduino_build_802863/Blink.ino.elf" Sketch uses 924 bytes (2%) of program storage space. Maximum is 32256 bytes. Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes. C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM13 -b115200 -D -Uflash:w:C:\Users\User\AppData\Local\Temp\arduino_build_802863/Blink.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:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" Using Port : COM13 Using Programmer : arduino Overriding Baud Rate : 115200 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xdb avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xdb avrdude done. Thank you. Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.

@evatech you now have 2 open discussions asking the same question. [image] Sketch won't upload to Uno, programmer is not responding Avrdude, stk500, Bootloader issues Hi I'm getting this error message when I try to upload a sketch to my Uno R3. Any idea what the problem could be? Arduino: 1.8.19 (Windows 7), Board: "Arduino Uno" C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino…

AND is this discussion also related to your problem? [image] Bootloader Uno to Uno, invalid device signature Avrdude, stk500, Bootloader issues Hello! I've had trouble uploading sketches to one of my Unos so I thought I'd try to burn a new bootlader to it from another functioning Uno, but this is also causing problems. I've tried connecting the two boards via the digital and power pins and using the ICSP header pins but I get an error both times. Anyone know how to fix this? I've checked all the cables are connected properly and have followed the instructions on the Arduino website carefully (correct port, Board: "Arduino Uno", Programm…

Thanks! I couldn't see it on the page so thought it hadn't posted properly before.

Thanks. Yes I've gone through all the suggestions, including loopback test (which worked fine).

Thanks Mark. Yes, the Uno is connected via a fully functioning USB cable (power + data USB cable). It is naturally on (green 'on' LED is lit, in case there is any doubt). Device manager indicates the UNO is on COM13. "Has your UNO uploaded successfully before?" I believe it has - I haven't used it for a couple of years but it was fine when I last used it.

You could try a loopback test to try and establish some level of functionality: [image] How to do a loopback test A loopback test is a troubleshooting procedure to test the serial communication between the PC and Arduino board with a dedicated USB to Serial converter chip. Supported boards Arduino UNO R3 (and... Did you over-write the bootloader on the UNO?

Please provide the details of your project that you were working on when you started experiencing the problem. Further Is your Uno an genuine one or a clone? Did it ever work before? Anything connected to pins 0 and 1? That can interfere with the upload. Anything connected to the Uno; try upload with Uno only connected to the PC.

Sketch won't upload to Uno, programmer is not responding

Development Tools Uploading

markd833 August 11, 2023, 9:10am 7

AND is this discussion also related to your problem?

Topic		Replies	Views
I cann't uploade Blink Uploading	21	472	October 2, 2025
Programmer is not responding Uploading	41	1161	June 7, 2026
Stuck uploading to Arduino UNO Uploading	16	3672	May 16, 2024
Upload fails: "programmer is not responding" Uploading	17	445	August 6, 2026
PROBLEM SOLVED - DEFECTIVE ARDURINO BOARD - I'm stumped. Can't upload any sketches to Uno or Mega, I could 9 years ago Uploading	23	611	May 7, 2026

Sketch won't upload to Uno, programmer is not responding

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