Open Theremin V3 won't calibrate

Hi all

First post here. I got an Open Theremin V3 and I got to the calibration stage but it won't calibrate. I let it warm up. Hit the function button or 2 seconds, turns yellow and then turns back read when it should blink in yellow to signal the calibration.

Anyone know what the issue could be?

Thank you

It will likely tell by itself what the problem is. Connect it via USB to your computer, start the Arduino IDE, select the correct port and launch the serial monitor at 57600 baud.
When pushing the calibration button now, you should see the verbose output of the calibration procedure, including the measured oscillator frequencies and the respective tuning ranges of the pitch and the volume side.

If you don‘t know how to interpret this, copy/paste the output here and someone will explain it to you.