Zenithink 10.1" C93 8GB 20A13-08-15 version dual camera
This version suits to C93(two cameras) model with barcode C93-K5-xxx-8GB-ZNSxxx-xx.
Using TF card
First extract the firmware which you get or download, then copy the whole "zt-update" directory into the root directory of TF card.
Put the TF card into TF card slot, then press the "Volume Plus" button at the same time to press the power-on button, then operate as per the reminders shown on the screen, the machine will be installed the firmware and then reboot.
Note: keep charged when the machine is being installed the firmware.
