Right after. Later I tried to install emuNAND, and even if it seems that it worked, I still can't access the settings and I don't have any way to upgrade back to 10.3Is this right after you downgraded or did you do other things to your system before you tried to enter the eShop and System Settings?
The only thing I can think of is trying to update by running Pasta CFW, installing sysUpdater and grabbing the CIAs you need to update to 10.5, then updating through sysUpdater.Right after. Later I tried to install emuNAND, and even if it seems that it worked, I still can't access the settings and I don't have any way to upgrade back to 10.3
Thaanks, nothing had worked, but after installing rxtools, randomly the 3ds started loading the settings again.You said that it seems the EmuNAND installation worked. Have you tried to access EmuNAND through rxtools? You can do that through MenuHax.