Pair and Connect Your Keyboard in 2.4G Mode (B/B Plus Version)

Please try the steps as follows:

Plug in the receiver first then short-press Fn+Y. The light under Y should flash slowly until the connection is successful.  Please make sure that the keyboard is close to the adaptor. Also, please rule out signal interference by other devices.

If it still can not work, you should try the steps below to rematch the keyboard and the dongle.

1) First press FN+Y to enter 2.4G mode.
2) Reinsert the receiver and make sure only one receiver can be connected to the device.
3) Make sure that the keyboard is close to the adaptor.
4)Long-press FN+Y to pair, then the indicator will blink, when the pairing is successful, the indicator will turn off.
5) If no pairing is successful, the indicator will blink for 10 seconds, then turn off and return to USB mode.