--- title: Firmware update slug: one/mcu-firmware/firmware-update docTags: createdAt: 2026-06-10T18:09:42.876Z --- This page explains how to flash the MCU firmware file (`.UF2`) to the Flipper One MCU via USB. The process differs depending on the Flipper One hardware revision. *** # Identify the hardware revision You can identify Flipper One hardware revision by checking the following: | **Difference** | **Rev. F0B0C1** | **Rev. 2.F0B1C2** | | ----------------------- | --------------- | ----------------- | | Label on the Main PCB | ONE-Main-F0B0C1 | ONE-Main-2.F0B1C2 | | Screws on the back | 5 Hex screws | 6 Philips screws | | LAN port LEDs visible | No | Yes | | LED in the Power button | No | Yes | If you are still unsure which hardware revision you have, try both guides one after the other. *** # Flash the MCU firmware To flash firmware to the Flipper One MCU: ::::::::::Tabs :::::::::Tab{title="On rev. F0B0C1"} ::::::::WorkflowBlock :::WorkflowBlockItem Get the `flipper-one-mcu-f1-firmware-*.uf2` file, where `f1` corresponds to the F0B0C1 revision. There are two options: - Download the file from the [Update Server](https://update.flipperzero.one/builds/flipper-one-mcu/dev/). - [Build the file from source](docId\:rPL7t5P9mlahA2PNMzj63) if you have modified the firmware source code. ::: :::WorkflowBlockItem Connect Flipper One to your PC via the **USB-C 1** port. ![](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/CFGs188UQTbALaSmGyZOy_mcu-firmware-usbc1-connection.png) ::: :::::::WorkflowBlockItem Switch the MCU to **BOOTSEL (DFU)** mode. There are two ways to do this: - **Via the App Switcher menu.** This method works if MCU mode is working on your device. - **Using a button combination.** This method works even if the MCU has never been flashed before and MCU mode is not working. To switch the MCU to BOOTSEL (DFU) mode: ::::::Tabs :::::Tab{title="Via the App Switcher menu"} ::::WorkflowBlock :::WorkflowBlockItem Switch the device to MCU mode. Turn it on if it's off, and stop Flipper OS if it's running. ::: :::WorkflowBlockItem Press the :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/i7WNvL3ZVyjiTJ8eb9hpW_app-switcher-button.png" alt caption} **App switcher** button from the MCU mode main screen. ::: :::WorkflowBlockItem Press the **DFU** soft button. ::: :::: ::::: :::::Tab{title="Using a button combination"} ::::WorkflowBlock :::WorkflowBlockItem Press and hold the **PTT** button. ![BOOTSEL step 1: hold PTT button](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/Kfp0HIEus2HmUHLGW5_RC_mcu-bootsel-rev-f0-b0-c1-step-1.png) ::: :::WorkflowBlockItem Keep holding **PTT** button. Press and hold **Left** and **Back** buttons for **3 seconds**, then release. ![BOOTSEL step 2: hold Left and Back buttons](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/r_vz8ECUzaNgTcTUzKKQR_mcu-bootsel-rev-f0-b0-c1-step-2.png) ::: :::WorkflowBlockItem Release the **PTT** button. ![BOOTSEL step 3: release PTT button](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/a9cmN4OdIEeZvLXVHBPZT_mcu-bootsel-f0b0c1-step-3.png) ::: :::: ::::: :::::: After switching the MCU to BOOTSEL mode, Flipper One's screen backlight will turn OFF and the device will appear on your PC as a Mass Storage Device named `RP2350`. If Flipper One doesn't appear, try a different USB cable and repeat the BOOTSEL procedure. ::::::: ::::WorkflowBlockItem Upload the `.UF2` firmware file to the Mass Storage Device. :::Iframe{code="" iframeHeight="350"} ::: :::hint{type="success"} **MCU firmware successfully updated!** Once the `.UF2` file upload is complete, Flipper One will automatically reboot, and the Mass Storage Device will disconnect from your PC. ::: :::: :::::::: ::::::::: :::::::::Tab{title="On rev. 2.F0B1C2"} ::::::::WorkflowBlock :::WorkflowBlockItem Get the `flipper-one-mcu-f2-firmware-*.uf2` file, where `f2` corresponds to the 2.F0B1C2 revision. There are two options: - Download the file from the [Update Server](https://update.flipperzero.one/builds/flipper-one-mcu/dev/). - [Build the file from source](docId\:rPL7t5P9mlahA2PNMzj63) if you have modified the firmware source code. ::: :::WorkflowBlockItem Connect Flipper One to your PC via the **USB-C 1** port. ![](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/CFGs188UQTbALaSmGyZOy_mcu-firmware-usbc1-connection.png) ::: :::::::WorkflowBlockItem Switch the MCU to **BOOTSEL (DFU)** mode. There are two ways to do this: - **Via the App Switcher menu.** This method works if MCU mode is working on your device. - **Using a button combination.** This method works even if the MCU has never been flashed before and MCU mode is not working. To switch the MCU to BOOTSEL (DFU) mode: ::::::Tabs :::::Tab{title="Via the App Switcher menu"} ::::WorkflowBlock :::WorkflowBlockItem Switch the device to MCU mode. Turn it on if it's off, and stop Flipper OS if it's running. ::: :::WorkflowBlockItem Press the :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/i7WNvL3ZVyjiTJ8eb9hpW_app-switcher-button.png" alt caption} **App switcher** button from the MCU mode main screen. ::: :::WorkflowBlockItem Press the **DFU** soft button. ::: :::: ::::: :::::Tab{title="Using a button combination"} ::::WorkflowBlock :::WorkflowBlockItem Press and hold the :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/HRIrqquSMpbXMOzU0uYrp_esc-button.png" alt caption} and :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/i2vQba-RZRz-lfq_ScALs_run-button.png" alt caption} buttons. ![BOOTSEL step 1: hold the Esc and Run buttons](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/E93wrO-1YcOxVVYxesRoT_mcu-bootsel-2f0b1c2-step-1.png) ::: :::WorkflowBlockItem Keep holding the :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/HRIrqquSMpbXMOzU0uYrp_esc-button.png" alt caption} **Esc** and :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/i2vQba-RZRz-lfq_ScALs_run-button.png" alt caption} **Run** buttons. Press and hold **Left** and **Back** buttons for **3 seconds**, then release. ![BOOTSEL step 2: hold Left and Back buttons](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/NACHJw_CihasHYzQbXZvz_mcu-bootsel-2f0b1c2-step-2.png) ::: :::WorkflowBlockItem Release the :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/HRIrqquSMpbXMOzU0uYrp_esc-button.png" alt caption} **Esc** and :inlineImage[]{src="https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/i2vQba-RZRz-lfq_ScALs_run-button.png" alt caption} **Run** buttons. ![BOOTSEL step 3: release hold the Esc and Run buttons](https://api.archbee.com/api/optimize/3StCFqarJkJQZV-7N79yY/yJXlJ6sCMuQqN2Nfm0g7T_mcu-bootsel-2f0b1c2-step-3.png) ::: :::: ::::: :::::: After switching the MCU to BOOTSEL mode, Flipper One's backlight will turn OFF, the Power button LED will turn purple, and the device will appear on your PC as a Mass Storage Device named `FlipperOneMCU`. If Flipper One doesn't appear, try a different USB cable and repeat the BOOTSEL procedure. ::::::: ::::WorkflowBlockItem Upload the `.UF2` firmware file to the Mass Storage Device. :::Iframe{code="" iframeHeight="350"} ::: :::hint{type="success"} **MCU firmware successfully updated!** Once the `.UF2` file upload is complete, Flipper One will automatically reboot, and the Mass Storage Device will disconnect from your PC. ::: :::: :::::::: ::::::::: ::::::::::