2-13AiGuru S2 Wireless Skype PhoneDuring the firmware updating, turning the handset off or removing theUSB cable will seriously damage the handset.Firmware upgradeFollow the instructions below for firmwareupdating.Update the firmware to obtain the best performance and stablity.1. Connect your handset to your PC through the providing USB cable and clickthe Firmware Upgrade button to apply the latest firmware for your handset.2. The warning message appears Do not power off.3. After the process is complete, follow the instruction to reboot the handset.