The Bluetooth module supports an AT mode that allows you to examine and change its configuration and settings. To utilize the AT mode, connect the Bluetooth module to the F3 and FTDI as shown in the following diagram.

Recommended steps to enter AT mode:

• Disconnect the F3 and FTDI from your laptop.
• Connect F3’s GND pin to the Bluetooth’s GND pin using a Female/Female (F/F) wire(preferably, a black one).
• Connect F3’s 5V pin to the Bluetooth’s VCC pin using a F/F wire (preferably, ared one).
• Connect the FTDI TXO pin to the Bluetooth’s RXD pin using a Female/Male (F/M) wire.
• Now connect the FTDI to your laptop via USB cable.
• Next connect the F3 to your laptop via USB cable while simultaneously pressing and holding the button on the Bluetooth module (kinda tricky).

When your serial connection is established, you may get a bunch of repeatedly being displayed. If this happens, just hit ENTER to stop the errors.