You can make a hard reset to your PulseOn device by pressing both buttons down for 20 seconds. After this press the right side button for 3 seconds to turn the device on. The device will turn on in "HR only mode".

More info on HR only mode and 3rd party apps:

To continue using PulseOn application again after a reset, you will need to undo old PulseOn pairing(s) from your mobile phone and pair again.

To set PulseOn device in pairing mode, please keep both buttons pressed down for 6 seconds, an icon will appear on the device screen. 

Then, please pair your PulseOn again with the mobile application.

See also: