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There are two ways to upgrade the firmware. The firmware's name must be
named as "update.img". Copy it to the root directory of SD card.
One way:
1. Insert the SD card and power on the device, it'll pop up a dialog window as
shown below after the device boots completely.
2. Click "Install", then the device will update the new firmware and reboot
automatically.
Firmware update guide (SDcard)
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