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1. Connect device to the computer though a USB cable , Select “Battery Test” - “
Setting” - “USB Upgrade” on the device , It will enters to the upgrade mode as shown in
Picture3.
2.
Download upgrade tool from official website and Run the “updatetool” Click
“refresh ” to find the virtual serial port generated by the device.
SOFTWARE UPGRADE
(Picture1)
(Picture2)
(Picture3)
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