PiPO Max-M7 pro 3G - Manual (Page 23)

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press the ESC key for a few seconds, at the same time press “reset”,
release ESC until the tool finds your tablet,
if “reset” and “esc ” fail,
hold “ESC” and “powe” r button, make you tablet set into upgrading
mode.
3. After the PC finding out the tablet, and the device icon
turns green, click “upgrade” for upgrading.