if keypad is not working in nokia 2720 fold then it can be solved with this diagram that is attached with this post.all keys are defined with different colors and all keys with same link have same colors in diagram all inner and outer points of key are with same color can be jumper with each other if any of then is not connected with keypad ic.so if any key or a set of keys is not working you can make jumpers by following color schema in diagram as shown.
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