taken from
ReadMii (USB Loader GX) under step1
Try installing a cIOS with a cIOS
installer (using IOS36). If this doesn't work (if you get an error while installing), you don't have a patched IOS (needed by the cIOS installer) and you have to use one of the two methods below.
Online method (Using wifi on the wii)
Get the Trucha bug restorer by wiipower and run it with the HBC. You will see a lot of white text on a black screen. This is how many installers/patchers look like. It has no nice banner and stuff to keep the filesize low.
1) Select IOS36 and press A. Even more text appears, read it if you want. Wait for the text at the bottom to appear and press 1.
2) Choose Downgrade IOS15. Then download from NUS (2 times). Follow instructions on the screen.
3) Now we can use the downgraded IOS15 to restore the Trucha in IOS36. Run TBR again. This time choose IOS15 and again press A then 1 when the text appears.
4) Go into the IOS36 menu. Use these configurations: 36 (this is in what IOS-slot the patched IOS36 will be placed.) YES YES NO (actually you can choose what you want for the last 2 options), then select Install patched IOS36 and press A. Choose Download from NUS once again and follow on screen instructions.
5) Now we have the patched IOS36, we can restore our IOS15 again. Load the TBR one last time. Choose IOS36,... .This time choose restore IOS15. Get the IOS from NUS and let the app finish everything.
We are ready to install our cIOS. I will explain here how to get cIOS38r14 by waninkoko. You can also install another rev of this cIOS (don't go lower than r9) or a rev of IOS222/223 by hermes. All IOS have different uses and bugs. Its up to you to find out what these are.
Get the installer here:
FileTrip - cIOS - installer 15 . Follow all the instructions at the link, but choose IOS36 instead of IOS249 (this is why we have patched IOS36). When you are asked to use wad install or online install, choose online install. You will then have the cIOS needed by the USB loader.