Remote radio won't connect

Hello, everyone I’m very new to this so I’m not exactly well informed but I do have a problem I need help solving. Last week I haven’t had any problems connecting my radios but as of now they don’t want to connect for some reason. I managed to get my ground control radio to establish a solid connection with a solid green light after messing around with mission planner and troubleshooting, but my drone radio still won’t connect at all. This is a pixhawk 4 with 915 Mhz radios. Thank you for your time.

Please Re-Calibrate the remote controller… If that not solved your problem send video