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Directly from Boox M92 user's manual:
Firmware Update
Before you proceed make sure device has enough power to finish the software update (at least 2 battery bars displayed) or connect the device to a USB power supply (PC, charger).
You can update the firmware by performing the following steps.
Download the latest update package from Onyx website.
Save the update package on the SD memory card.
Make sure the update package is located in the root directory of the memory card. You do not need to extract the package. Also leave the name of update package as it is.
Insert the SD card into device.
Restart the device and press and hold the OK button (the center of the joystick button). The OK button should be pressed before the device restarts. Hold it until you see the message Software update request detected, checking updates.... The reader updates itself automatically. It will restart once the update finishes.
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