I downgraded my 3DS (old) firmware from 8.1.x-xx to 4.2.x-xx earlier, and I have been trying to upgrade to 9.2.0-20 to no avail. I have Pasta CFW, I have 3DNUS, I have the update files, and I have sysUpdater, but I still cannot seem to figure out how to upgrade. Would someone help me, please? Also, what are sysNAND and emuNAND exactly? I am guessing that they are system memory and emulated memory respectively, but I have no idea what they are for, nor what upgrading/downgrading them affects.