I successfully installed rxTools and emuNAND on my old 3ds XL firmware 8.1. Then, I tried to use sysUpdater to update my sysNAND to firmware 9.0. Everything was proceeding smoothly. The .CIAs were being installed one by one. Then, the screen just went black. I tried switching off and restarting my 3ds and removing the SD card but it's still black. I am also unable to start the system in recovery mode (A + Up + L + R doesn't work). Please help!