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PX4 Firmware
Today (10.2.2019) the firmware for the PX4 is a custom build based on the 1.8.2 release. The firmware is maintained in the github repository:
This is a fork from the PX4 Firmware maintained by PX4 team. I have contributed two commits to the firmware which landed in upstream
The changes to the upstream firmware are based on the stable branch which is today the 1.8.2 release. The changes are maintained in the “searchwing18” branch.