small observations. R9-SX have telemetry hang after 1-2 minutes. Connected as F.Port. Firmware Access latest 1.3.3. FC Pixpilot-V6 FW Plane 4.5.7. R9 SLIM+ OTA with latest access fw works without issues with same settings.
And R9-SX and R9 SLIM+ OTA works without issues with Matek h743 wing, fw plane 4.5.7