Pixhawk 4 security alert
If you operate your Pixhawk 4 with ArduPilot firmware (ArduCopter) and use a S.BUS receiver, there may be a technical problem with receiving the RC signal, which can lead to a complete loss of control. Until ArduPilot releases an official BugFix, we ask you to use the BugFix provided by the manufacturer HolyBro based on the ArduCopter version 3.6.1. The file "arducopter3.61sbusfix.apj" can be downloaded here.
Nov 27, 2018