Receivers from Spektrum use to have a bind jumper plug I only know Spektrum stuff used it for decades,

@EricMB
Eric,
I do not see a model # and nothing comes up, on-line, in reference to what you suggested.
How old is this unit? Have you tried binding as I suggested? Have you tried binding by powering up the receiver first and then the transmitter? If neither of these work, some older "imports" used stick positions to enter bind mode.
Beyond that, I can not come up with any suggestions, sorry.

@ToraDog it’s a Tamco TAX6, model number as shown.. thank you!

On another forum, Modelboatbits is said to be very helpful with those radios. You may try calling them.

https://www.modelboatbits.com/

@EricMB Which transmitter do you have, model number?

@ToraDog thanks, but there’s no bind button on the TX…

@EricMB
The internet says, 1) make sure that the receiver and x-mitter are at least 70 cm apart. I have found this to be the case with other brands as well. 2) Press and hold the bind button on the x-mitter and turn the x-mitter on. Continue to hold the Bind button on the x-mitter. 3) While still holding the bind button on the x-mitter, turn on the receiver. Hold the bind button on the x-mitter until the LED on the receiver stops flashing and becomes a solid red. 4) If solid red shows, bind is successful. Release the bind button. I would then tune off the receiver, followed by the transmitter. Then turn on the transmitter, follwed by the receiver and check for bind and correct operation.