L1
Service
Manual
TCL
Communication Ltd.
Rev.
4060A Level 1 Service Manual
Page
1.1
25/28
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There are two upgrade mode during the power off status..
a. Insert the USB cable, and then reinstall the USB driver (You can refer to the item 3.2 for the details of
Android USB driver installation)
b. If the device cannot power off. Press volume up +volume down key in the same time (the device will
displays below interface), then press volume up key about 3s, insert the USB cable to start upgrade
process.
After the above operations, please go on proceed with the normal process.