How to Disassemble the K4?
1. Remove the screw from the frame (skip this step if you have the plastic keyboard version);
2. Take off the keycaps and remove the screw (total 15 pcs) on the PCB board as shown below;
3. Pull the PCB board out as shown below（remember to take it off with a caution, do not break the switch place where the red highlight circle as shown below).