1. Remove the screws from the frame (skip this if you have a plastic frame version keyboard).
Screw Type for K8 frame: KB2.5*6mm (Inner hex:H2mm, hex nut:Ф4.2mm)
2. Pull off the keycaps and remove the screws on the PCB as shown in following image.
Screw Type for K8 plate: KA2.3*8mm (Cross head screw. Nut: Ф3.5mm)
3. Take out the side frames.
4. Then you will be able to take out the PCB.
(Note: Please be careful of the toggles on the side when you disassemble the keyboard and reassemble it.)