Sennheiser Bluetooth Headset Disconnecting with Dongle After Firmware Update

If your Sennheiser Bluetooth headset won't pair back to its dongle after a firmware update, you can try one of the following quick resets.

Note: All of these headsets are now discontinued, so we don't have much more information outside of the article. However, these instructions should get you what you need!

MB660 Reset

1. Switch the Headset OFF. To do this, turn the earphones so the headset is flat as if it's going back into its case. It will say “Power Off"
2. Press the Effect Mode button for 4 seconds. This is the bottom button on the right side of the headset. (the inside of the headband will have R for right and L for left)

Note: after holding the button down for 4 seconds, it will not give us any light or say anything. To see if the reset worked we can try pairing the headset to the phone again.

MB Pro1/2 Factory Reset

*Please note this reset should be performed when the headset is NOT plugged into the charging cable or on the charging stand.*

1. Turn the headset off by pressing and holding the multi-function button (this is the button you press to answer calls) for 4-6 seconds until the headset says "Power Off"
2. Press and hold the multi-function button again until the LED flashes RED/BLUE (this is Pairing Mode)
3. After it starts blinking, keep holding the multi-function button and then press and hold the mute button for 5 seconds and the LED will flash PURPLE 3 times then starts flashing RED/BLUE
4. Once the flashing stops, the headset has been reset

Sennheiser Presence UC Reset

Turn the headset off by sliding the metal panel at the bottom of the headset closed.

1. Press and hold both volume buttons. These are the small black lines at the top of the headset
2. While holding the volume buttons, slide the metal panel down to power the headset on
3. The light on the headset will flash purple quickly 3 times and then enter pairing mode (flashing red/blue)
4. The headset is now ready to pair to a Bluetooth device

If none of the resets work:

1. Check to see if you updated the dongle only or dongle and the headset. If you did dongle only, you will need to do the headset, too
2. If you did update the headset too, you can pair the headset to a mobile device (such as a cell phone to see if it will pair properly without the dong. If it will, the issue lies with the dongle. If the headset also won't pair to a cell phone, then the issue is following the headset

Time For A New Headset?

Many Customers have upgraded to the Leitner LH670.