Why Remove Peripherals When Flashing Firmware
Less than 1 minuteSoftware toolsSpeedyBee APP固件刷写外设拔除DFU 模式故障排除
Important
Flight controllers that support APP firmware flashing:
CoreWing F405 WING V2 with CoreWing Wireless USB Expansion Board PRO
I. Detailed Steps for Disconnecting Peripherals
- Remove the battery
- Disconnect all peripherals, leaving only the expansion board connected to the flight controller
- Connect a USB data cable to the expansion board to power on the flight controller
- Check the "I have disconnected peripherals" option
- Click Start Connection
II. Analysis of Why Peripherals Need to be Disconnected
Important
CoreWing F405 WING V2, when the flight controller firmware is functioning normally, can automatically enter DFU mode when using the SpeedyBee APP to flash firmware.
Important
Because certain peripherals can interfere with the flight controller's boot mode pins (especially BOOT0 or USB level detection), causing the flight controller to fail to enter DFU mode or not be recognized as an STM32 DFU device.
The following factors can prevent it from "entering DFU":
| Interference Source | Description |
|---|---|
| Serial peripherals (such as GPS, receiver) | Occupies TX/RX, affecting bootloader judgment |
| I2C/SPI devices (such as compass) | Pulls levels low/high, causing the flight controller to misjudge as "external boot" |
| Unisolated peripheral power supply | Peripherals "back-power" the flight controller main control through signal lines, causing instability |
| Some high-current modules | Such as HD video transmitters, laser rangefinders, etc., can overwhelm the USB power supply, causing recognition failure |