# Arduino Nano ESP32 Stuck in DFU mode — No COM Port, All Flash Attempts Fail **URL:** \ **Category:** Nano ESP32\ **Created:** [April 6, 2025, 5:44pm UTC](https://forum.arduino.cc/t/arduino-nano-esp32-stuck-in-dfu-mode-no-com-port-all-flash-attempts-fail/1370989 "2025-04-06T17:44:24Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![cr\_txt](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/cr_txt/32/1209590_2.png) [@cr\_txt](https://forum.arduino.cc/u/cr_txt)\ **Post date:** [April 6, 2025, 5:44pm UTC](https://forum.arduino.cc/t/arduino-nano-esp32-stuck-in-dfu-mode-no-com-port-all-flash-attempts-fail/1370989/1 "2025-04-06T17:44:24Z")
Hi, I’ve got an arduino nano esp32 that’s stuck in DFU mode. It doesn’t show up as a COM port, only as a USB DFU device in device manager. I’ve tried: - Pressing reset once and double-tapping reset - Arduino web flasher (never detects the board) - Using arduino-cli (but it can't see any ports) - esptool.py (fails to connect bc no serial port) - dfu-util (can't find correct firmware offsets for nano esp32) - different USB cables and ports I’ve installed the arduino agent, tried chrome/edge, still no detection. I just want to restore the board to factory firmware so it shows up again as a normal serial device. Any ideas? is there a way to fully recover this thing from DFU mode? Thanks in advance. ---
**Author:** ![lburelli](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/lburelli/32/989898_2.png) [@lburelli](https://forum.arduino.cc/u/lburelli)\ **Post date:** [April 17, 2025, 7:48am UTC](https://forum.arduino.cc/t/arduino-nano-esp32-stuck-in-dfu-mode-no-com-port-all-flash-attempts-fail/1370989/2 "2025-04-17T07:48:57Z")
Hello @cr_txt, sorry for the delay. Not sure what is happening on your board, but have a look at [this procedure](https://support.arduino.cc/hc/en-us/articles/9810414060188-Reset-the-Arduino-bootloader-on-the-Nano-ESP32), it will definitely recover it 🙂 you only need the Arduino IDE and the _Arduino ESP32 boards_ package. 🛠 Let us know if you were able to reflash your Nano ESP32! ---
**Author:** ![cr\_txt](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/cr_txt/32/1209590_2.png) [@cr\_txt](https://forum.arduino.cc/u/cr_txt)\ **Post date:** [May 4, 2025, 8:13pm UTC](https://forum.arduino.cc/t/arduino-nano-esp32-stuck-in-dfu-mode-no-com-port-all-flash-attempts-fail/1370989/3 "2025-05-04T20:13:19Z")
Thank you for replying! The Arduino functions correctly on another PC, but not on mine. It appears that my system does not recognize any serial/COM port associated with the Arduino—only the DFU port is detected. I have attempted to reset the firmware and burn the bootloader (on the other computer, as mine fails to detect the COM port), but neither method was successful. ---
**Author:** ![lburelli](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/lburelli/32/989898_2.png) [@lburelli](https://forum.arduino.cc/u/lburelli)\ **Post date:** [May 5, 2025, 8:23am UTC](https://forum.arduino.cc/t/arduino-nano-esp32-stuck-in-dfu-mode-no-com-port-all-flash-attempts-fail/1370989/4 "2025-05-05T08:23:33Z")
Maybe you are simply missing the Nano ESP32 drivers on your PC. Please follow [this advice](https://forum.arduino.cc/t/my-arduino-nano-esp32-doesnt-upload-the-code/1378793/4) to get those! 🙂