Quick procedure:
1. Press ‘Menu’
2. Dial 4, Press ‘Select’
3. Dial 9, Press ‘Select’
4. Dial 3, Press ‘Select’
5. Dial password ‘0000’
6. Confirm ‘Yes’ that you are sure you want to reboot.

Detailed instructions:
From the home screen of the cordless phone press the ‘Menu’ button which is the left menu button just under the display.

Dial 4 on the dial pad and press ‘Select’ button which is the left menu button just under the display.

Dial 9 on the dial pad and press ‘Select’ button which is the left menu button just under the display.

Dial 3 on the dial pad and press ‘Select’ button which is the left menu button just under the display.

Dial the password on the dial pad. Default password is ‘0000’ or ‘1234’.

Press the ‘Yes’ button which is the left menu button just under the display.