Reset the credentials. To do this, see
below:

It is best to save the command as a text file(.txt), then when choosing the option send command, choose the option from the
fileotherwise you can pair the receiver to your PC and get
connected through "bluetooth", use any serial debug software like Stonex Assistant to
send the command. On stonex Assistant click on the icon of the receivers and
enter manually the com port, then go to debug window and send the command.