How to reflash the bootloader on a Fly-E3-v2

Overview

This page covers how to reflash the bootloader on a Fly-E3-v2.

Software

These instructions cover flashing with Windows using the STM32CubeProgrammer software. It is possible to use other software, such as DFU-Utils on linux, but they aren’t covered here. You will have to register to be able to download the software.

Connection via DFU

While holding down the reset2, plug in the USB cable into the board and PC.

Fly-E3-v2 DFU Bootloader Button
Fly-E3-v2 DFU Bootloader Button

Process

Launch the STM32CubeProgrammer Software.
Download the bootloader from here.
Select the correct connection method, in this instance its “USB”. You may need to click the refesh button to find it. Then click connect.

STM32CubeProgrammer1
Connect via USB

Then click on the “+” icon and find/open the bootloader file you downloaded earlier.

STM32CubeProgrammer2
Open File

Click the “Download” button.

STM32CubeProgrammer3
Download Bootloader to the board

A “File Download Complete” popup will appear once complete.

STM32CubeProgrammer4
Download Complete

Disconnect the board and continue flashing the firmware as normal.

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