Don't let this thread die!!!! Who still uses their 4pk?

Have a 4pks-r and trying to bind to r603fs receiver but getting blinking green light on the receiver. Error states invalid id. Radio is set to C1 and I've tried both types of servo setting. I have reset the models and have tried different models also. I'm stumped.

Needs to be set for c2 for the 603fs

Thanks but I did try that and both servo types just to try. Manual and Futaba state it should be C1. Was hoping for a reset trick or maybe a firmware update but alas, will need to send back to Futaba once their back up and running.