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If you’re looking for a nice and complete how-to about how to install the USB Loader GX on a WII 4.2 play console, beneath you’ll find an instruction how-to in 8 steps guide:

original site URL: http://wehackwii.pbworks.com/w/page/8844446/USB-Loader

In case the original links should not be availlable any more, you can find all necessary files here: (except homebrew)

USB Loader Guide (These 8 steps take about 20 minutes)

Welcome:

This guide is targeted at people wit no hacks/mods on their Wii, so essentially a store-bought system. However, this guide can still help people that have the HomeBrew Channel already installed (simply do step 1 and then skip to step 5).

Disclaimer:
WiiHacks and its editors are not responsible for any harm done to your system by using our guides. This guide is meant to be simple and clean, and works on all Wii systems to get them modified. However, after you have modified an LU64 or newer Wii system, DO NOT use downgrade applications or anything that alters IOS files (besides what is in this guide), cIOS installers, and new IOS files from games released in 2009 and beyond. (This may cause a brick [dead Wii].)

Korean Wii Systems:

You will need to alter this guide.  Do step 1 and 2 (load the Wii Hacks Package and Bannerbomb onto your SD card), but alter step 2 to launch DOP-Mii (instead of the HackMii installer) by placing its boot.dol on the root of your card.  Then follow steps 5 and 6, then use DOP-Mii to install the latest version of IOS34 and IOS61 (but say NO to the Sig Hash Check and ES_Identify patches).  A proper guide for this will be set up at a future date if there is demand (there is also help on the CSG).
What You Need:

• An SD or SDHC card formatted as FAT32, and a card reader/writer. We recommend the SanDisk brand cards as they have been the most successful.
• If you don’t have the Homebrew Channel or BootMii, download BannerBomb and the HackMii installer.
• Download the WiiHackWii Package

Summary:

In this guide you will

1. (Steps 1 through 4) Install the HomeBrew Channel and BootMii via BannerBomb
2. (Step 5) Restore the Trucha Bug to IOS36
3. (Step 6) Delete IOS stubs (installed by Nintendo to prevent hacking)
4. (Step 7) Install cIOS222 to enable homebrew access to the USB port and DVD drive
5. (Step Install cIOSx (a.k.a. cIOS 249) to enable compatibility with a broader range of homebrew

The terms IOS and cIOS are going to come up a lot in this guide.  If you’re curious about what they mean, go check out the IOS Information page.
Instructions:

This guide is meant to be simple for you and clean for your Wii. It will attempt to explain each step clearly and provides notes before certain steps so that you can understand what you are doing, why, and how to address any problems.

STEP 1. UnZip and load the contents of the WeHackWii Package to your SD Card. Optionally, you should read the included README.txt for some useful information.

Note: Skip steps 2 through 4 if you already have the HomeBrew Channel and BootMii (but make sure to do step 4-1 if you don’t have a NAND backup, otherwise you will have a horrible time trying to recover from a brick).

STEP 2. Follow the BannerBomb instructions to load BannerBomb and the HackMii installer onto your SD card properly, and launch HackMii installer.
STEP 3. You are now in the HackMii installer. Install everything (only the HomeBrew Channel is required, BootMii as boot2 is strongly recommended [although if you can only install as IOS do it anyway], and DVDx is at your discretion).

Note: DVDx is an older method for playing DVD movies on your Wii. It is no longer the recommended method, and so we don’t feel you should install DVDx. Instead, the best way to play media content on your Wii (including DVD movies) is via WiiMC.

STEP 4. When done, exit to the System Menu.

Note: Step 5 is meant to restore the Trucha Bug to IOS36. The purpose of this is to allow step 7 to use IOS36 to install a cIOS (custom IOS). The cIOS is what will allow backup launchers such as USB Loader GX to access the USB port and the DVD drive.

If you don’t wish to launch backup games, you are done and can move on to optionally upgrade/downgrade your Firmware and/or head over to WiiBrew Wiki to get some fresh, homemade homebrew applications.

STEP 5. Run DOP-Mii from the HomeBrew Channel.

Open the DOP-Mii Instructions, follow the “Restoring the Trucha Bug” section

Go to the HomeBrew Channel Upside-Down and Backwards section if that happens.

Note: Step 6 is only necessary for those on Wii Firmware 4.2, although it also ensures a clean Wii system for all others. The reason step 6 is important for 4.2 is that along with the System Menu, stub IOS files were installed to slots 222, 223, 249, and 250 in order to prevent cIOS files from being installed. These must be deleted in order for step 7 to succeed on a 4.2 or higher Wii system.

STEP 6. Run DOP-Mii from the HomeBrew Channel.

Open the DOP-Mii Instructions, follow the “Stub IOS Removal” section

OR

Use the included AnyTitle Deleter DB to delete (if they exist on your Wii) IOS202, IOS222, IOS223, IOS249, IOS250, IOS254

Note: Step 7 installs a cIOS, and is the whole reason for the previous steps. This cIOS gives HomeBrew access to the USB drive and the DVD drive, among other things. This allows the included USB Loader GX to create/run backup games on/from your USB drive.

If you are unable to get step 7 to work for you, then delete the 00000001 folder from your SD card and try again. If you’re still having trouble, check the cIOS222 page for additional help.
STEP 7. Remove all GameCube memory cards and controllers for this step! Open the HomeBrew Channel and run the cIOS222 v4 Installer.

Note: If you get ret= -1035 as an error message, it means you didn’t properly delete the stub IOS files as mentioned in Step 6.

STEP 8. Remove all GameCube memory cards and controllers for this step! Open the HomeBrew Channel and run the cIOS249 rev17 Installer.

Note: If you don’t have the latest WeHackWii Package which includes the IOS38 WAD file, then WAD installation won’t work for step 8b and you’ll need to use < Network installation >.

You now have a fully hacked Wii with the following:
HomeBrew Channel, BootMii, cIOS 222, cIOS 249, and USB Loader GX