Password is geekbuying.com
1, TF card upgrade method
Copy .img firmware files to you TF card.
The TF card into the TF card slot inside the machine.
Boot, when he was in the main interface will prompt you to update the firmware.
2, USB Upgrade method
First, Open the upgrade tool
Third, S7800 shutdown mode, connect the USB cable.
Maybe you need install RK usbdrives for your computer. You can find it in the firmware package.
Forth, Press volume – button and hold, then press power button 5 seconds.
Fifth, If the upgrade tool find your device, and the upgrade tool “1” will turns to green.
Click “升级 upgrade” key, then will begin to upgrade.