Bose SoundLink Color II Troubleshooting Manual page 2

Try another USB charging cable
Try another USB wall charger or powered computer USB port
If you are using a surge protector or multi-outlet converter, try plugging directly into the socket
Put the product into Ship Mode to reset it (your settings and stored devices will not be erased):
Connect the speaker's power cable
Press and hold the Multi-function button for 10 seconds
While continuing to hold the Multi-function button, unplug the speaker from power
Release the Multi-function button
Reconnect the power cable and test the speaker
Difficulty using Party and Stereo modes
Applies to:

SoundLink Micro Bluetooth® speaker
Please try the following steps if you are having trouble using the Party and Stereo feature:
Use the Connect app to pair speakers
Party and Stereo modes can be enabled either by using the Bose® Connect
app or manual pairing using the speaker buttons. However, the Connect app
pairing method is strongly recommended for two reasons:

The procedure on the Connect app is designed to be user friendly

The Connect app allows any combination of compatible speakers to enter Party or Stereo
modes. (For example, a Revolve and a Revolve+ can be paired together.) The manual method of
using the speaker buttons only allows you to pair two of the same speaker model