OK, so I decided to copy my post from here to a thread of its own in an attempt to highlight what is more or less safe to do on a Wii U's vWii WiiMode, and what is not safe to do, to try to raise awareness and educate users to try help prevent them from bricking their WiiMode. Keep in mind though, that this list is only really based on my experiences with vWii, and a few other experiences by other users too. Maybe this could be useful enough to get stickied? Wow, it did get stickied! Thanks! So, here is my basic list thus far: Safe (should be ok to run without worry): - homebrew that does not install anything or require installation, or even better, ones that do not write to NAND at all - installing The Homebrew Channel. While this does install to NAND, this is the most reputable of all Wii homebrew launchers, and the authors (Team Twiizers) make sure it is as safe as possible before they release it. Potential risk of brick but still more or less doable (make sure you have a NAND backup, or at the very least a key dump from the modified xyzzy + hardware programmer): - Installing channel wads (same reason as on regular Wii, mainly only if they have a bad banner or something, otherwise if they are confirmed ok, then they should be safe) - Installing non-critical system parts, like game IOS, patched IOS, or cIOS into unused slots (such as d2x v10 vWii version), as long as one is installing vWii versions only on vWii, and regular Wii versions only on regular Wii (they are not used by System Menu and should be fine to remove and reinstall if you screw them up) - Modifying 1-513 "BC-WFS". According to crediar, this is used by vWii to be able to load up and give compatibility to Dragon Quest X. Dragon Quest uses it's own "WFS" formatted USB drive, so that is probably why. BC-WFS is encrypted, so it cannot be successfully modified until the encryption is publicly cracked. But messing it up should not harm anything on vWii other than Dragon Quest X. Will brick if you do it wrong, you can do these BUT only do if you know EXACTLY what you are doing: (a NAND dump, and at the very least a xyzzy key dump + hardware programmer will be the ONLY thing to save you if you screw up, due to no bootmii as boot2 on vWii) - Modifying System Menu IOS in any way (is currently IOS80) - Modifying 1-512 "BC-NAND". According to crediar, this title is needed by vWii to be able to load NAND titles, like channels. Messing this up would break channel loading, which is no good, but disc games should still work. Breaking this would be harder to fix due to the inability to load channels. It is also encrypted, so cannot be successfully modified until the encryption is publicly cracked. DO NOT do, this stuff is just plain stupid and confirmed as not working and brick causing: - Installing regular Wii IOS on vWii. Installing non-critical IOS will result in those IOS having very limited functionality and crashing very easily, installing old System Menu IOS (IOS 80 atm) will cause vWii to brick. - Installing vWii IOS on regular Wii. This actually seems worse than the inverse. While Wii IOS maybe actually load up on vWii but still crash when trying anything, vWii IOS on regular Wii will not work at all. Also, users have reported very strange Wii bricks (among them being myself and FIX94) from installing vWii IOS on them, even non-critical ones... I have no clue why they do this, but new IOS for new hardware, there has got to be a reason somewhere. - Installing older IOS, or stub IOS, or deleting IOS that you do not enough about. - Modifying vWii System Menu in any way, including priiloader or "themes". Do not modify the System Menu's .dol, it has extra encryption that has not been publicly cracked yet. Also cannot install priiloader for the same reason. Since vWii System Menu is not the same as regular Wii's System menu, regular Wii "themes" are not compatible, and will brick vWii. AFAIK there are no vWii themes released at this time, and I myself am unsure about making or installing my own myself, as I have not tried it yet. - Trying to do or install anything at all if you do not know what you are doing, seriously, read up and learn about everything before attempting to mod anything, this should be a given! What is recommended to do: - Install The Homebrew Channel. - Then run the modified xyzzy v1.2.1 unnofficial provided by DarkMatterCore on your vWii via HBC. It will dump your vWii's unique per-console encryption keys that are needed to decrypt and re-encrypt a dump of your vWii's NAND on PC, useful in case if you brick vWii, you can (or send it to someone who can) dump the vWii's NAND into PC using a hardware programmer, like an Infectus (no longer manufactured) or Progskeet, and then decrypt it to alter it and fix it, then re--encrypt and reflash the fixed NAND dump onto the vWii's NAND chip. Especially useful due to there not being any vWii version of BootMii. - Educate yourself on whatever it is you want to do before doing it, do not just follow guides without learning about what each part does. Be lazy and you could pay the price for it someday! - Again, only mess around with important stuff if you know EXACTLY what you are doing beforehand. It is your own responsibility if you end up bricking anything. As you can see above, there are several things, that if you break them, can only be fixed with hardware programmer + keys from xyzzy. Now do keep in mind though, if you DO brick your WiiMode vWii, Wii U mode will still function fine, you will just no longer have any Wii Backwards Compatibility though. But still, hopefully this still does not happen to you. Long story short, all that is needed is some education, plus awareness of what could happen, and some common sense. Having those unique per-console keys helps too Especially since: performing any sort of "unauthorized technical modifications", AKA any of this, will void your console's warranty! Remember that too.