The WinBook BIOS update fixes a potential issue that causes Bluetooth devices to stop functioning with the tablet. To update the BIOS:Download the BIOS update from this link: Download BIOS UpdatePlug in the AC adapter. Do not attempt to flash the BIOS on battery power.Close any open programs. The tablet will reboot during the process.Double click the BIOS flash file.The flash will run automatically. Do not turn off the tablet during this process.