Setting a PPM input (flexi or mainport) in ground modem mean you want RcControl and telemetry.Setting "PPM only" you get only RcControl without telemetry, so baudrate link is set automatically to 9600bds with an extra range because radio noise floor is lower at 9600bds.
YesFirst OPLM with PPM on one port (input from Radio) and set as coordinator: Ground sideThe other with one port set as PPM for PPM output (Txpin) connected to Flexio PPMin on NanoLike this:
The blinking stay stable on board ?
Try upgrade&Erase againDisconnect board firstHit upgrade&Erase buttonWait until reconnect.If works after that, try setting with small amount of power : in some cases and hardware issues, RF can cause reboot.