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HC-924 DFU flashing article does not apply to Uno WiFi Rev2 #2

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Feb 14, 2022
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HC-924 DFU flashing article does not apply to Uno WiFi Rev2 #2

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16 changes: 13 additions & 3 deletions content/Hardware/Generic/Flash-USB-to-serial-firmware-in-DFU-mode.md
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title: "Flash USB-to-serial firmware in DFU mode"
---

UNO and Mega boards use either an Atmega16U2 or Atmega8U2 chip as a USB-to-serial converter, with its own firmware. The firmware can be flashed by connecting it to a computer and setting the board to **DFU mode** (Device Firmware Update).
The following boards use either an Atmega16U2 or Atmega8U2 chip as a USB-to-serial converter:

* Arduino Uno
* Arduino Uno Rev3
* Arduino Mega
* Arduino Mega2560 Rev3
* Arduino MegaADK Rev3

The converter chip firmware can be flashed with a computer by setting the board to **DFU mode** (Device Firmware Update).

> Note that this article does _not_ apply to the Uno WiFi Rev2, which uses a different chip with closed source firmware.

## 1. Get the firmware

Expand All @@ -14,8 +24,8 @@ Within the platform directory, the usb to serial firmware is found in `firmwares
|-----------------------|------------------------------------------------|
| Arduino Mega2560 Rev3 | Arduino-usbserial-atmega16u2-Mega2560-Rev3.hex |
| Arduino MegaADK Rev3 | Arduino-usbserial-atmega16u2-MegaADK-Rev3.hex |
| Arduino UNO Rev3 | Arduino-usbserial-atmega16u2-Uno-Rev3.hex |
| Arduino UNO | Arduino-usbserial-uno.hex |
| Arduino Uno Rev3 | Arduino-usbserial-atmega16u2-Uno-Rev3.hex |
| Arduino Uno | Arduino-usbserial-uno.hex |
| Arduino Mega | Arduino-usbserial-mega.hex |

## 2. Program the chip with the firmware
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2 changes: 1 addition & 1 deletion ...rdware/Generic/If Arduino-UNO-or-Mega-2560-is-not-recognized-by-the-computer.md
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title: "If Arduino UNO or Mega 2560 is not recognized by the computer"
---

Missing or corrupted **USB-to-Serial** firmware can cause UNO and Mega boards to be recognized as any of the following:
Missing or corrupted **USB-to-Serial** firmware can cause Uno (except WiFi Rev2) and Mega boards to be recognized as any of the following:

- Unknown Device
- Composite Device
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4 changes: 2 additions & 2 deletions content/Hardware/Generic/Set-a-board-to-DFU-mode.md
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title: "Set a board to DFU mode"
---

UNO and Mega boards use either an Atmega16U2 or Atmega8U2 chip as a USB-to-serial converter. By setting a board to **DFU mode** you can [upload USB-to-Serial firmware to the chip](https://support.arduino.cc/hc/en-us/articles/4408887452434-Flash-USB-to-serial-firmware-in-DFU-mode).
Uno (except WiFi Rev2) and Mega boards use either an Atmega16U2 or Atmega8U2 chip as a USB-to-serial converter. By setting a board to **DFU mode** you can [upload USB-to-Serial firmware to the chip](https://support.arduino.cc/hc/en-us/articles/4408887452434-Flash-USB-to-serial-firmware-in-DFU-mode).

1. Connect the board to your computer

2. Find the RESET and GND pins for the ATmega USB-Serial Processor. They are the innermost two pins of the six located close to the Ethernet port.

![Uno front DFU reset](img/UNO-DFU-reset-pins.png)

3. Briefly short the pins (follow [these instructions](#rev1) for UNO Rev1)
3. Briefly short the pins (follow [these instructions](#rev1) for Uno Rev1)

The board will reset to DFU mode.

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