# Hung on uploading **URL:** \ **Category:** Uploading\ **Created:** [September 25, 2025, 12:08am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471 "2025-09-25T00:08:25Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![pompanomike](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/pompanomike/32/1238398_2.png) [@pompanomike](https://forum.arduino.cc/u/pompanomike)\ **Post date:** [September 25, 2025, 12:08am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/1 "2025-09-25T00:08:25Z")
Im simply just trying to upload a test sketch to my arduino nano (Nano 3.0 ATmega328P CH340) and its stuck on uploading. The Port is set properly, the board is set properly, but it still refuses to load the sketch onto the nano. I enabled verbose logging and this is what shows up at the end: ```arduino Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2014 Joerg Wunsch System wide configuration file is "C:\Users\xhick\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" Using Port : COM4 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=0x8a avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x8a avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x8a ``` Things I've already tried: Pressing the reset button while uploading/as soon as it starts Trying a different usb port Trying a different usb cable entirely Trying a different processor (old bootloader) Different sketches Can someone please help? ---
**Author:** ![ptillisch](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@ptillisch](https://forum.arduino.cc/u/ptillisch)\ **Post date:** [September 25, 2025, 12:10am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/2 "2025-09-25T00:10:38Z")
Hi @pompanomike. Please try this experiment and then report the results: * * * ❗ This procedure is not intended to solve the problem. The purpose is to gather more information. * * * 1. Connect the Arduino board to your computer with a USB cable. 2. Press and release the button on the Arduino board that is marked " **RESET**". Now please [reply](https://meta.discourse.org/t/discourse-new-user-guide/96331#replying-11) here on this forum topic with the answers to the following questions: - Did you see the LED marked " **L**" on the board blink immediately after you released the " **RESET**" button? - Did the LED blink only once, or did it blink multiple times quickly immediately after releasing the button? ---
**Author:** ![pompanomike](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/pompanomike/32/1238398_2.png) [@pompanomike](https://forum.arduino.cc/u/pompanomike)\ **Post date:** [September 25, 2025, 12:14am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/3 "2025-09-25T00:14:01Z")
It only blinks 1 time quickly and then goes to blinking on and off every second ---
**Author:** ![ptillisch](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@ptillisch](https://forum.arduino.cc/u/ptillisch)\ **Post date:** [September 25, 2025, 12:19am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/4 "2025-09-25T00:19:45Z")
A program called a "[bootloader](https://docs.arduino.cc/hacking/software/Bootloader)" is stored in a special area of memory in the **Nano** board's microcontroller. The [classic **Nano**](https://docs.arduino.cc/hardware/nano) (as well as its 3rd party derivatives) have been manufactured with two different types of bootloader installed. You must configure the **Tools \> Processor** menu in Arduino IDE according to which bootloader is installed on your **Nano**. Having the incorrect configuration selected in this menu is one of the potential causes of uploads failing with the "`avrdude: stk500_recv(): programmer is not responding`" error. The single blink on reset tells us that your **Nano** board has the "old" bootloader installed. I can see from the verbose upload output that you have Arduino IDE incorrectly configured for use with the **Nano** boards that have the modern bootloader. Select **Tools \> Processor \> ATmega328P (Old Bootloader)** from the Arduino IDE menus and then try uploading again. Hopefully this time the upload will finish successfully. If it still fails, please provide the full verbose output that is produced from the upload attempt with the corrected **Tools \> Processor** configuration. Please note that it is expected that uploads will fail when using a board with the "old" bootloader while you have Arduino IDE in the **Tools \> Processor \> ATmega328P** configuration, so it is essential for you to leave it in the **Tools \> Processor \> ATmega328P (Old Bootloader)** during all subsequent troubleshooting efforts. ---
**Author:** ![pompanomike](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/pompanomike/32/1238398_2.png) [@pompanomike](https://forum.arduino.cc/u/pompanomike)\ **Post date:** [September 25, 2025, 12:22am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/5 "2025-09-25T00:22:11Z")
This worked, thank you the past few times ive used the old bootloader it would throw a random error, but after it threw the error this time i tried to just reupload and it went through perfectly. ---
**Author:** ![ptillisch](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@ptillisch](https://forum.arduino.cc/u/ptillisch)\ **Post date:** [September 25, 2025, 12:48am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/6 "2025-09-25T00:48:44Z")
You are welcome. I'm glad it is working now. > [@pompanomike](#): > > the past few times ive used the old bootloader it would throw a random error If you encounter this problem again, just let us know and we'll investigate further. It might have been caused by some completely separate problem that will have its own distinct solution. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [March 24, 2026, 12:48am UTC](https://forum.arduino.cc/t/hung-on-uploading/1407471/7 "2026-03-24T00:48:45Z")
Closed on March 24, 2026, 12:48am UTC This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.