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5.2 Upgrade via side buttons
Step 1: Copy the upgrade file “MstarUpgrade.bin” to the root directory in the Udisk;
Step 2: Insert the Udisk into the “ANDROID-USB” port on the front frame;
Step 3: After normal shutdown, turn the power switch from “-” to “o” to power off the product;
Step 4: Long press the “VOL+” button in the middle of the 7 buttons on the button board at the lower right corner
of the front frame, and also turn the hard switch on the back of the product from “o” to “-” to power on the product;
