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Restart your mobile device
If you cannot pair your (smart)phone or tablet with another bluetooth-capable device (e.g. computer, tablet, bluetooth speaker/headphones, etc.) restart the mobile device. After it turns on, you should be able to pair it with another device, provided that its bluetooth feature works.
If you cannot pair your computer with another bluetooth-capable device (e.g. smartphone, tablet, bluetooth speaker/headphones, keyboard, mouse etc.) restart the computer, after which you should be able to pair the device.
Also, you can fix this problem by removing all USB devices that are connected to the computer, such as USB keyboards and mice, USB external hard drives, or flash drives, and then restart the computer. Wait for a minute or two, and then re-attach the USB accessories.
Make sure to be within the device's Bluetooth range
Maybe your device's Bluetooth feature works, but your device is out of range of the other Bluetooth device. The range can vary from 3 to 100 metres, depending on your device. If you are not sure what range your device can cover, search for its bluetooth specifications on the Internet.
Enabling and disabling the Airplane mode is like a soft restart of the device's components, one of which is the Bluetooth feature. Before you do anything else, enable the airplane mode and disable it after a few seconds.
If you cannot pair your computer with another bluetooth-capable device (e.g. smartphone, tablet, bluetooth speaker/headphones, keyboard, etc.) restart the computer, after which you should be able to pair it.
This is the best way to resolve bluetooth-pairing issues your bluetooth speaker might experience. By resetting your bluetooth speaker you will clear the list of paired devices, which might be responsible for this issue in the first place.
Most of the speakers can be reset if you press and hold the Mute button for at least 10 seconds and press the power button afterwards.
Note: If the above-mentioned instruction didn't work, consult your speaker's manual.