My brother's Joy- con has some drift and I was going to open it up to clean the joy-stick or if anything replace the it. I managed to open 3/4 of the screws on the back of the Joy-con. Only one screw is giving a tuff time for some reason. I used a Y000 screwdriver to open 3 of them but for some reason I can't unscrew the one on the very top. This is what the screw looks like like

I used some other small screwdrivers but nothing worked. It hasn't even moved an inch. This is the screw driver I used. I tested this on other Joy-cons and to my surprise, only 2 I was able to unscrew on the bottom. But I can't unscrew very top or the second one on top. I'm guessing they made it differents for all Joy-cons unless if I'm doing something wrong. Can anybody help me on how I can unscrew this or give my suggestions? That would be appreciated.