![]() If this is not the case, you can download and install the drivers manually: In the COM Port it should show “AT32 Virtual COM Port”. When you first plug an AT32 flight controller into your PC, Windows normally installs the drivers automatically, and Betaflight should be able to connect to it after a few seconds. If you have an iPhone (also works for android phones) which doesn’t support OTG, then your only option is to get the Speedybee adapter: AT32 Flight Controllers But you can also use the Speedybee Adapter 3 and connect through WiFi. You can change settings and flash firmware just like the computer software.įor android phones, the cheapest way to connect to the Speedybee app is using a OTG cable: (product page, affiliate link). If you have a computer like that, just use the Speedybee APP on your smartphone (learn more here). I tried everything, different cables, installed all the possible firmware, tried many things over the course of 6 months to no avail. It connected to Betaflight just fine, but just couldn’t flash. I had one computer that was never able to flash Betaflight firmware. Once installed, you need to go back to the same place to allow unauthorised application, Silabs in this case. Go into SYSTEM PREFERENCES, then SECURITY & PRIVACY, then unlock using padlock at the bottom left, then click (some users are not able to unlock the disk) ENABLE USERS. How to Install Driver On MacOSĭriver installation on a Mac is different.ĭownload the CP210X driver for MacOS, and install that.ĭuring the install your Mac won’t allow you install it because it’s an unauthorised app. Also disconnect everything that takes 5V power from the FC. Such as receiver, GPS etc, everything that uses the UART. If there’s no way you can get into DFU mode to flash firmware, and driver doesn’t seem to be an issue, then you should try disconnecting everything from the flight controller. Put your FC in bootloader mode again and run ImpulseRC driver fixer, in Betaflight Configurator’s COM port, it should now show up as “STM32 BOOTLOADER” and it should allow you to flash firmware now.Now unplug the FC and reboot your computer.With your FC connected to the computer in bootloader/DFU mode, go to Device Manager, find Guillemot STM DFU Device, right click it and Uninstall it, make sure to check “uninstall driver”.To fix this you have to remove Guillemot first: When re-installing driver with Zadig or ImpluseRC driver fixer, it would show up as “STM32 BOOTLOADER” but would then it would always revert back to “Guillemot STM DFU Device”. ![]() If it’s there, congratulations you have found the problem! It’s the wrong driver.Go to Device Manager and see if you can find “ Guillemot STM DFU Device” under any Device Type, e.g.Put your FC in bootloader mode (aka DFU mode, to do this, power off the FC first by unpluging USB cable and LiPo, hold down the boot button on the FC, then plug in the USB cable).The correct DFU driver should be “ STM32 BOOTLOADER“. ![]() If you can connect to the flight controller, but unable to flash firmware and it gives you the “Failed to open serial port” error even after running the ImpulseRC driver fixer, it’s possible that you have a wrong DFU driver installed e.g. You need to enter DFU Mode for flashing firmware, see how to do it here: Once that’s completed successfully, fire up Betaflight Configurator and try to connect to or flash your flight controller and it should work. This tool will automatically search for your FC, and install whatever driver you need on your computer.Download and run ImpulseRC Driver Fixer Tool here (Warning: it’s a 3rd party software, please scan it with AV software before running it).Connect your FC to the computer via USB Cable. ![]() If that didn’t work, try running the ImpulseRC Driver Fixer. This is perhaps the most common issue when connecting to or flashing a flight controller in Betaflight Configurator.įirst thing to try would be a different USB cable, make sure it’s a data cable, not a charging-only cable.
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