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commit 94306e9 Merge: 3e5e361 8f9748e Author: pedromsousalima <32345730+pedromsousalima@users.noreply.github.com> Date: Fri Oct 3 14:10:08 2025 +0200 Merge pull request #2649 from arduino/pedromsousalima/modulinos/STEP-files [PXCT-1222] Modulino STEP files commit 3e5e361 Merge: 56c7309 b918c50 Author: BenjaminDannegard <b.dannegard@arduino.cc> Date: Fri Oct 3 13:09:27 2025 +0200 Merge pull request #2654 from arduino/benjamindannegard/organize-widgets-documentation [PXCT-1445] Cloud - Sorted widgets alphabetically commit 56c7309 Merge: e2436b4 71472e0 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Thu Oct 2 12:58:26 2025 -0500 Merge pull request #2653 from arduino/canchebagur/opta-user-manual-update-pi [PXCT-1480] - Opta User Manual Update (Programmable Inputs) commit b918c50 Author: BenjaminDannegård <benjamin.dannegard@gmail.com> Date: Thu Oct 2 19:45:41 2025 +0200 Sorted widgets alphabeticaly commit 71472e0 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Thu Oct 2 12:23:49 2025 -0500 Content update (assets) commit 8f9748e Author: pedromsousalima <32345730+pedromsousalima@users.noreply.github.com> Date: Thu Oct 2 18:24:29 2025 +0200 Added other pages commit e2436b4 Merge: e4d7e56 347ef44 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Thu Oct 2 11:12:06 2025 -0500 Merge pull request #2651 from arduino/canchebagur/nano-r4-manual-update-qwicc [PXCT-1475] - Nano R4 Update User Manual (Qwiic Connector Information) commit 347ef44 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Thu Oct 2 09:53:41 2025 -0500 Content update (assets) commit e4d7e56 Merge: 3de222a b25f36f Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Thu Oct 2 09:24:18 2025 -0500 Merge pull request #2650 from arduino/canchebagur/nano-r4-user-manual-update-bootloader-2 [PXCT-1474] - Nano R4 Update Tutorial (Bootloader) commit 52b9714 Author: pedromsousalima <32345730+pedromsousalima@users.noreply.github.com> Date: Thu Oct 2 15:27:34 2025 +0200 changed name commit 0d699da Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 13:04:39 2025 -0500 Content update (Qwiic connector information) commit b25f36f Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 12:20:13 2025 -0500 Content update (bootloader section on the user manual) commit abfbf29 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 11:40:38 2025 -0500 Content update (assets) commit 32ea0f3 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 11:23:38 2025 -0500 Content update (initial commit) commit 3de222a Merge: 0a12910 ab6e1fd Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 08:34:42 2025 -0500 Merge pull request #2648 from arduino/canchebagur/nano-r4-user-manual-update-i2c [PXCT-1375] - Nano R4 User Manual Update (I2C Section) commit 0a12910 Merge: 52dcdfc e815b23 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Wed Oct 1 08:06:53 2025 -0500 Merge pull request #2646 from arduino/canchebagur/nano-r4-user-manual-update-bootloader [PXCT-1460] - Nano R4 User Manual Update (Bootloader Section) commit bee5c12 Author: pedromsousalima <32345730+pedromsousalima@users.noreply.github.com> Date: Wed Oct 1 11:11:52 2025 +0200 Test STEP Tested with modulino buttons STEP file commit ab6e1fd Author: TaddyHC <94547080+TaddyHC@users.noreply.github.com> Date: Tue Sep 30 16:45:35 2025 -0600 Update content/hardware/03.nano/boards/nano-r4/tutorials/01.user-manual/content.md commit e815b23 Author: TaddyHC <94547080+TaddyHC@users.noreply.github.com> Date: Tue Sep 30 16:37:03 2025 -0600 Update content/hardware/03.nano/boards/nano-r4/tutorials/01.user-manual/content.md commit 9bb7f2d Author: TaddyHC <94547080+TaddyHC@users.noreply.github.com> Date: Tue Sep 30 16:36:55 2025 -0600 Update content/hardware/03.nano/boards/nano-r4/tutorials/01.user-manual/content.md commit d3c1057 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Tue Sep 30 10:56:48 2025 -0500 Content update (initial commit) commit 5147541 Author: José Antonio Bagur Nájera <josea.bagur@gmail.com> Date: Tue Sep 30 08:59:00 2025 -0500 Content update (initial commit)
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‎content/hardware/03.nano/boards/nano-r4/tutorials/03.bootloader-flashing/content.md‎

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### Software Requirements
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- [Arduino IDE 2.0+](https://www.arduino.cc/en/software/) or [Arduino Web Editor](https://create.arduino.cc/editor)
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- [Arduino IDE](https://www.arduino.cc/en/software/) or [Arduino Cloud Editor](https://create.arduino.cc/editor)
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- [Arduino UNO R4 Boards core](https://github.com/arduino/ArduinoCore-renesas) (latest version)
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- [Renesas Flash Programmer tool](https://www.renesas.com/en/software-tool/renesas-flash-programmer-programming-gui) (latest version)
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- The bootloader file (`dfu_nano.hex`, see next section for download options)
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***__Important note__: Make sure you have installed the `Arduino UNO R4 Boards` core version 1.0 or higher before proceeding. The bootloader file is included in this core installation.***
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***__Important note__: The Arduino IDE is NOT required for the bootloader flashing process itself, only for testing the board afterward.***
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## Understanding Bootloader Recovery
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## Preparing for Bootloader Flashing
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Before beginning the bootloader flashing process, you need to locate and prepare the necessary bootloader file that comes with the Arduino UNO R4 Boards core installation.
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### Obtaining the Bootloader File
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### Locating the Bootloader File
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**Option 1: Direct Download (recommended)**
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Download the bootloader file directly from the Arduino Renesas Core GitHub repository:
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- [Download dfu_nano.hex](https://github.com/arduino/ArduinoCore-renesas/blob/main/bootloaders/NANOR4/dfu_nano.hex)
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Click the "**Download raw file**" button and save it to a known location on your computer, as you will need it later in the Renesas Flash Programmer.
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![Bootloader file on the Arduino Renesas Core GitHub repository](assets/bootloader-raw-file.png)
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**Option 2: From Arduino IDE Installation (if already installed)**
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The bootloader file (`dfu_nano.hex`) is automatically installed when you add the `Arduino UNO R4 Boards` core through the Arduino IDE's Boards Manager. To find this file on your system:
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**Testing with the Blink Sketch**
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Open the Arduino IDE 2 and ensure the Arduino UNO R4 Boards core is installed via **Tools > Board > Boards Manager**. Select your board by navigating to **Tools > Board > Arduino UNO R4 Boards > Arduino Nano R4**. Select the correct port under **Tools > Port**. Your Nano R4 should now appear as "**Arduino Nano R4**".
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Open the Arduino IDE and ensure the **Arduino UNO R4 Boards** core is installed via **Tools > Board > Boards Manager**. Select your board by navigating to **Tools > Board > Arduino UNO R4 Boards > Arduino Nano R4**. Select the correct port under **Tools > Port**. Your Nano R4 should now appear as "**Arduino Nano R4**".
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Load the following Blink example sketch to test the bootloader:
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Load the following `Blink` example sketch to test the bootloader:
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```arduino
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/**
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![Blink sketch](assets/orange-led.gif)
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## Quick Verification
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After flashing, your board should:
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- ✅ Show up as "**Arduino Nano R4**" in your computer's device manager
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- ✅ Have only the green PWR LED lit when idle
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- ✅ Successfully upload and run the `Blink` sketch (if testing with Arduino IDE)
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If any of these checks fail, see the Troubleshooting section below.
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## Troubleshooting Common Issues
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If you encounter problems during the bootloader flashing process, here are common issues and solutions:
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