Low cost quadcopter build 4 - update to Betaflight 4.5.2
The SpeedyBee F405 V4 flight controller came with version 4.4.3 of Betaflight installed. The latest currently released version of Betaflight is 4.5.2 I have version 4.5.1 on my other builds, and GPS Rescue (Return to Home) works well. This video walks through the update process.