How to Disassemble the K4?
1. Remove the screw from the frame (skip this if you have a plastic frame version keyboard).
Screw type for K4 version 2 frame: KB2.6*6mm (inner hex:2.0mm, hex nut: Ф4.2mm)
2. Take off the keycaps and remove the screw (total 15 pcs) on the PCB board as shown below;
Screw type for K4 version 2 plate: KA2.3*7mm (Nut: Ф3.8mm)
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).