Introduction
Unscrew all screws (there are no screws on the bottom of the keyboard), there should be 13 screws.
Tools
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Unscrew all screws (there are no screws on the bottom of the keyboard), there should be 13 screws.
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After removing all the screws turn the keyboard upside down and the upper part should fell off, but hold it they are sill connected with black cable, unplug that cable.
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Using soldering iron touch its tip to the pin and when it melts press pump on it and push the button. Th pump should suck all the melted solder, if it failed try again
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Conclusion
To reassemble your device, follow these instructions in reverse order of course except soldering part.