I would download your files and then we can perform a Global Reset. We do not perform Global Resets just for simple battery changes, your data remains. Once downloaded, take a pen, and press the reset button that is in between the two right side buttons, all of your icons will light up, then press the bottom left and then press the top right. If done properly, you will see a new display, MONITOR S725, navigate with the right side buttons to DEFAULT SET. Press the red button. Should basically do a hard reboot.