Gently with a knife three sides of the keys first layer gash to wipe off the first layer between two clean. Can also be used for some time .ujMservice manual download site

 If you still can not be used , only the first layer to remove the whole key , but also to ensure the normal use of other keys . But be warned: Do not force too much , so the second layer of the circuit is also zoned off causing other buttons can not be used .ujMservice manual download site

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