To use skydroid H12 with Pixhawk based flight controllers these softwares are required to be downloaded from skydroid website.
H12 Manual : http://file.skydroid.xin/H12-Instruct...
Skydroid GCS : https://robokits.download/downloads/S...
HEQ APK : https://firmware.ardupilot.org/Tools/...
QGroundControl : Download latest from Google PlayStore