<!--coloro:red--><span style="color:red"><!--/coloro--><!--sizeo:4--><span style="font-size:14pt;line-height:100%"><!--/sizeo-->This method is for upgrading from a previously hacked Wii to 4.2 using Waninkoko's updater. Virgin 4.2 steps will eventually follow.<!--sizec--></span><!--/sizec--><!--colorc--></span><!--/colorc-->
I'm not going to go into how to update, nor am I going to put much into this section. If you already have your Wii hacked, hold tight with whatever version you're on now. If you already have 4.2 with no hacks, hold tight for a few days. The folks with BannerBomb are working hard to get a version that works with 4.2 and when they do, this section will get deleted anyway. But if you absolutely must upgrade, go right ahead-- and this is how to get things back up and running.
4.2 should not be downloaded or used. The only benefit it has is that you get to see a 4.2 in your Wii info instead of 4.1. It's sole purpose is to stop HomeBrew. It failed, of course, but it's an unecessary headache nonetheless. If you absolutely must upgrade to 4.2, you can make your life a whole lot easier by making sure you have upgraded to the latest HBC, DVDX, BootMii boot2 (if possible) and BootMii IOS (if not).
<!--coloro:red--><span style="color:red"><!--/coloro-->Note<!--colorc--></span><!--/colorc-->: If you do not have boot2, there is absolutely no brick protection available for 4.2. PreLoader is not yet supported, and BootMii as IOS is useless unless you can get to it from PreLoader. Hopefully this will change in the near future, but not yet.
Anyway..
<!--coloro:darkorange--><span style="color:darkorange"><!--/coloro-->Things you'll need<!--colorc--></span><!--/colorc-->:
1) SD card with a folder called <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->wad<!--colorc--></span><!--/colorc-->.
2) IOS249.wad created from NUSD. (Use NUSD 1.2 and click TMD, IOS, IOS249).
3) cBoot2 (send a message to <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->
[email protected]<!--colorc--></span><!--/colorc--> for this)
Steps:<ul><li>Extract <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->cBoot2.rar<!--colorc--></span><!--/colorc--></li><li>Extract <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->try this 1st.rar<!--colorc--></span><!--/colorc--></li><li>Copy the files extracted (<!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->bootmii, boot.dol, and startup.elf<!--colorc--></span><!--/colorc--> onto the root of your SD card. (Make sure you backup your old BootMii folder and files before doing this as it will copy over them.</li><li>Copy the <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->IOS249.wad<!--colorc--></span><!--/colorc--> file you created with NUSD inside of the <!--coloro:#0000FF--><span style="color:#0000FF"><!--/coloro-->wad<!--colorc--></span><!--/colorc--> folder on your SD card.</li><li>Put SD card into Wii.</li><li>Launch HBC, press Home, Load BootMii.</li><li>cBoot2 will automatically launch and you will see Wad Manager 1.4</li><li>Press A</li><li>Choose Wii SD</li><li>Select IOS249.wad</li><li>Press A</li><li>Left arrow</li><li>Select uninstall WAD</li><li>Press A to complete the uninstall.</li><li>Press Home to return to system menu.</li><li>Carry on with the guide (You can skip the first steps about getting HomeBrew/BootMii)</li></ul><!--coloro:red--><span style="color:red"><!--/coloro-->Note<!--colorc--></span><!--/colorc-->: 4.2 installed a stubbed IOS249, which has absolutely no purpose except to stop cIOS38rev14 from writing to that location. Removing it fixes the issue.