Shimano ultegra di2 help
I recently finished the build of my bike and on to setting up my di2 groupset. Its a full Ultegra R8000 di2 groupset. With the newest battery and the BL module installed.
When I press and hold the button on the junction box for about 1 sec it will go to the adjustment mode. When I press longer it will start blinking for a few times only the red led. Then just stops. I can't seem to go on the pairing mode where both the green and red leds will blink. Also when I double press the button nothing happens. So I cannot even switch between shift modes.
What could be the problem here? TIA