Chances are that band hero will not work, but your homebrew would (however if you were to ever remove your homebrew channel then you'd have to use the twilight hack to reinstall it)
If you want we could work through the process a long way. Though continuous forum posts make this problem longer than it is.
Though heres my instructions...
When you try running gecko OS what happens?
If it does not work - Lets try to figure it out; what does it do when it doesn't work...
If it does - This problem seems to be around the cheats, so if it does work and your cheats aren't working. Lets make sure that your cheat are set up properly on your SD card.
use this program -
http://wiird.l0nk.org/ocarina.zip to get your cheats installed to your card, I'll guide you through the process. This program is the long (but still easy) method to getting cheats onto your SD card.
1. Open up the zip folder
2. Open up the PC folder
3. Open codemgr.exe
Now you have your program open. Now to add cheats to it, its pretty simple. Follow this link
http://geckocodes.org/
This website has most of the codes you may want or need, however check the forums (Theres a link to it on the page) for any other codes for the game that may have not been posted. Sometimes your game may not be shown on website, so you may have to find the codes on the forum itself. When your looking for codes on this forum, use the search bar to search the game in the topics its for (Find anything relating to NTSC codes in the forum, then search there any of the other sticky pages)
Now onto adding codes to your program, when adding a game and codes follow these steps:
If you did not download a txt file from the website...
1. Add the game's ID which is found either on the CD or on the website. If your checking the CD check the underside and inner part of the CD (its small text so look closely). For a game like super smash brothers your game's ID would be RSBE-0B-01-USA. You can ignore the 0B and USA. Making the ID RSBE01.
2. Once its put in, you might want to put in the game name to keep it remembered for what game it is.
3. Click add code/comment/category and give it a name
4. under code contents, put in all the numbers of the code. Make sure that they are not all grouped at once, you'll have to put enters in them and they should be = 42000000 90000000 = 16 characters long.
5. Click on the code, then click store modification then you have your code. Add more codes as you please following this process.
To add codes to your SD card, either with a TXT or by your own creation, click export to GCT.
But before you click export to GCT make sure your code(s) are all checked in the plane to the left under the game ID.
Your codes should be added to their own folder and GCT on your SD card and are ready for Gecko OS.
-------------------------------------------------------------------------------------------------------------------------------------------
Now another method you could use is directly from your homebrew channel itself. Install the homebrew browser to your SD card (Follow its installation instructions) and look through the program for codemgr or something related to codes of sorts. Download it (it will install itself) and you'll be able to get codes that way. The program will download the codes txt files itself and allow you to turn them on or off as you decide. Then should be usable with gecko os.
If you have any futher questions or this isn't what you were looking for, then please add my email address (
[email protected]) to ask. I may not be on, but i'll try when i can.
Was told you have to use a MIOS Patcher before you can even use those apps? I got the homebrew on there through bannerbomb an I know how to put apps in, so I will try what you listed X3 cross fingers an hope it works, really dunno, knowing my luck my wii will attack me 
