First I formatted the SD using the Gateway app, after that I backed up EmuNand. Following that I did the FBI thing where I created a hs.app in my SD and unmounted it. Used the go.bat tool in my PC to change it to a namefilewithbanner.app, moved it into my SD changing the name back to hs.app and injected it sucsessfully. Then I copied the Old3DS files into my SD and ran the browser exploit in which you tap the bar at the top (previously having deleted history and cookies as well as having switched off wirless for the QR code) and got into the RXtools menu, I pressed L which was the button I assigned in the FBI thingie with the button press + screen tap. when I pressed L the screen had a message telling me it was installing extra files and it would take less than a minute, when it was over it said it was sucessful and to press any button, pressed a button but instead of going into EmuNand which I assume it is what is suppossed to do it got stuck on a black screen on top and a red screen bottom. Left it there for about 20 minutes, nothing, turned it off and tried again, when I press L at boot it freezes again, if I dont I can still go to hombrew. If I remove the SD card I can enter to SysNand no problem and can play with carts. Maybe I used old files in the "old3ds step"?