Why can't the screen content be cleared by pressing the key or NFC on Xiaomi LCD Writing Tablet 13.5" (Color Edition)?

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Please make sure that Clear Lock is turned on. If it is not turned on, the possible reasons are that the built-in battery is too low, or The battery polarity is reversed, or please refer to the instruction manual to replace the corresponding type (CR2025) of button battery.

Does it help?

Yes

No