This JBL Flip 3 reset procedure show you how to restore the unit to factory default state. It erases any earlier paired Bluetooth devices from its memory. Clearing these stops the Flip 3 from pairing to any nearby Bluetooth devices afterwards. Also, you might reset to get the speaker ready for sale or re gifting. Or reset it to stop it from pairing with devices you no longer have interest in.
JBL Flip 3 Reset: Step by Step Routine
1. Turn on the Speaker
Press and hold the Power button until it lights up.

Find the Power button, as shown in the last picture above.
Then, the Power button lights up along with the battery power scale, as shown next.

In our case, the speaker does not automatically enter pairing mode. Why? Because we have paired the speaker with Bluetooth devices since the last reset. We know that because the Power button glows solid gray, rather than blinks blue.
2. Wait for the Power Up Sound
The Flip 3 makes a rising electric guitar strum sound when it powers up. The unit is ready for use after this sound ends.
3. Press the Volume UP and Phone Buttons Together
See the next picture to find the Phone and UP Volume buttons. They are the rightmost two buttons in the row of buttons located right on the cloth grill.

The JBL Flip 3 then runs its reset routine, as shown in the next picture. Note that all lamps light up for a couple seconds as the reset takes effect. Shown next.

Then after a short pause, the speaker turns off. All the lights go off, and it makes the power-down guitar sound.

4. Check that your JBL Flip 3 Did Reset
Next, power on the Flip 3 again, as described in step 1 above. Press and release the Power button, as shown in the previous picture.
Now this time, after reset, our speaker comes up in Bluetooth discovery mode, as shown next. Note that the Power button blinks blue to denote this, as shown in the next picture. When it blinks blue or shows as solid white, the Flip 3 is not currently in a pairing session. Indeed, we expect it not to pair to anything after a reset.

5. Done with JBL Flip 3 Reset !
The JBL Flip 3 reset is now complete. You may now pack it up for sale, or pair it again with your favorite Bluetooth devices. The speaker will no longer automatically connect with any Bluetooth device. So to restore automatic pairing, manually pair the speaker with a device manually. Then whenever both speaker and that device are in range and running, pairing automatically takes place once more.