A1.After installing the button, first, check whether there is a gap between the button and the buckle and whether it can be pressed and rebounded normally. If there is a gap that can be pressed and rebounded normally, continue to install. If there are no gaps, proceed as follows: 1) Loosen the button screw for 2-3 turns. This method can make the space inside the button bigger, but it will make the whole button feel loose. 2) Add a gasket of M3 or M4 size to the yellow nut (the size of the gasket is about 5-6mm in outer diameter, 3.2mm in inner diameter, and 0.5mm in thickness. You can also trim a gasket with harder cardboard according to this size) , this method increases the pressing space at the other end by raising the nut. 3) Slightly loosen the back cover screws near the stuck button for 2-3 turns. For example, if R4 will be stuck, loosen the three screws closest to R4. This method can increase the pressing space, please be careful not to screw it too loosely. 2. Check if there is a gap at the top, because the gap is caused by deformation, and deformation may also cause the button to get stuck. If there is no gap, continue with the installation. If there is a gap, remove the thermal grease and reinstall it.