Air unit not connecting to ground unit?

raspberry pi 4b (air)
raspberry pi 3b (ground)
Atheros AR9271 802.11n 150MbpsWireless X 2soft
raspberry pi camera

manually flashed to 16gb sdcards with windows imageWriter.
air.txt and ground.txt add it to each sd card.

Unable to download openhd imageWriter because virus infected Windows 11 won’t let me download it.

ground unit boot showing HUD screen but no video feed from air unit.

I can’t find any thing about setting for connections.
help, this is my first time with OpenHD I had some experience with EZ-Wifibroadcast.

Okay, I got it.
I had to flash SD cards several times and something got click, it start working, I don’t know why and how…