You're on a firmware 9.0 or greater, right? Change the theme at least once and have the homebrew starter pack on your SD card (boot.3dsx and 3ds folder). Use browserhax to get into the homebrew menu and choose menuhax installer. Follow instructions from there (or take a look at https://github.com/Plailect/Guide/wiki/Part-1-(Homebrew) for more detailled steps).
Yes I was able to update to 9.2. Thank you !