Thats funny I just checked my lense and it does'nt let me change the apeture either. I have the lense that is picture in the video tutorial the Q-Tip hack is'nt woking on mine.
Are you trying it with the hack and mounted to something?
If so try flipping the other switch inside and then remounting and then openning and closing again.
BTW Timur, I am sure the Q-Tip thing was on the tablet with the other 5 commandments