So I just succeeded in downgrading my O3ds. The process is not at all that difficult but there are users reporting system bricks. Here are the things that you have to check before reporting a system brick: Did you do a hash check on the zip? Use http://onlinemd5.com/ to check the hashes. The correct hashes are listed on the Tutorial threads. If your files are corrupt we can't help you. Are all the files copied? The total amount of downgrade CIA is different for each package. Check that the amount of files matches the ones in the zip. I've had my SD card accidentally unmounted on my computer and eventually only ~65 (out of 130) files were copied. Check this before beginning. Did you get the correct region/firmware? If you didn't, we can't help you. That being said, there are a few thing that you can do yourself in case something breaks/sysupdater refuses to work: If you can still access the Homemenu/settings app, just update using the normal way. No files are lost and nothing will go wrong until Nintendo releases 10.4>=. This can happen if not all CIA's were installed. In case your 3ds blackscreens, remove your SD card first. Homemenuhax might be causing trouble. If you can't access Homemenu/settings app, and your 3DS blackscreens and you already removed your SD card, you've got a soft brick. The most common causes of these are the things I told you to check. To fix a soft-brick hold L+R+A+UP whilst booting your 3DS and select to update. If you can get access to the settings app, but can't update, disable Tubehax DNS. Then update again. If you can't get access to the settings app, but can get access to homemenu, update using a card. To find out with what version you can update with which card go to http://www.3dsdb.com/. This should work, even if you have Tubehax DNS enabled. If you can't get access to any of these (but can get access to safe mode!) you need to try and connect whilst you have no connection (go out of range on network). This will open WiFi settings and you should be able to disable Tubehax DNS from there. If you can't get access to WiFi settings... good luck! If you can't get into safe mode, you have a hard brick. Good luck!