HP Officejet 150 Mobile All-in-One Printer - L511a - Manual (Page 125)

To set the printer to be not visible
1.
Touch right arrow , and then touch Bluetooth on the control panel.
2. Select Settings, and then select Visibility.
3. Touch Not Visible.
The printer is inaccessible to Bluetooth devices that have not stored its device address.
Reset Bluetooth settings
To reset Bluetooth settings on the printer to the factory defaults:
1.
Touch right arrow , and then touch Bluetooth on the control panel.
2. Touch Settings, and then touch Reset Bluetooth.
Set Bluetooth security for the printer 121