Make sure you have sd:\bootmii_ios.bin and sd:\cboot2_cios.bin sd:\bootmii
Casper is a program that will load mini code, like bootmii and cboot2 dol loader. It is an elf file that can be loaded via loader or exploit. There are 3 versions of it found here- Casper
In its default setup it loads sd:\bootmii_ios.bin, this is the armboot.bin from bootmii. Cboot2 casper is just hex edit to load sd:\cboot2_cios.bin.
To the point, you must get casper to load, which you have done, and you must get it to load sd:\bootmii_ios.bin which you have not done. You may wish to experiment with the other versions of casper to see if perhaps they will load bootmii for you.
This should work, it is most likely an issue with your sd card, or just picky picky software. But you must get it to work, no need to try anything else as casper loading cboot2 is the only way your going to hack this wii.
I'll edit this post and put in if the 2GB works or not.
*Edit* Okay I tried my Family's 2GB San Disk SD Card and when I go to Apploader -> (Wii SD Slot) -> Apps -> bootmii-casper -> boot.elf it loads up that path "sd:/bootmii_ios.bin" ios flags 254 v65281 and then it comes up with a blank screen lasts like 2 seconds and then it pops up with the Wii windows and loads back up the Wii Menu. I also tried using Casper's new update v0.3 and when I load bootmii-casper -> boot.elf it takes a few seconds on this blank screen then the Wii Menu loads back up. I noticed it says v0.2 when I load it. it doesn't show the v0.3 on the top left side. Not sure if thats the issue or what. All I know is I've been trying everything and its not working!!
The card does not have to be big, mine is 250mb. Perhaps test these files on another wii, specifically your ability to load bootmii.
*Edit* Okay so I can load up Wii Mod v3.1 and it says on the top right side "Current IOS:80 v54321" below that it says "AHBROT Enabled" in Green letters. Now on my friends Wii I didn't notice the AHBROT Enabled on the top right side. and What do you konw, I go to Apploader -> Bootmii-casper -> boot.elf and it brings up that "sd:/bootmii_ios.bin" ios flags 254 v65281 and it loads the Wii Menu back up. This is on my already Softmodded Wii I used the Softmod any Wii Guide.
*Edit* Okay I launched Bootmii from HBC on my Wii and my Wii Drive is Flashing Blue and theres nothing on the screen. is this normal or probably not huh?
*Edit 2* Fixed the flashing drive noticed I accidently put the bootmii folder in there twice like bootmii -> bootmii -> then the other files. Well I got bootmii to load but now heres where I get stuck again my Wii Remote disconnects and I can't reconnect it in order to click on the stuff I see on the screen "Wii" "the homebrew channel" "SD" and these 2 Gears I see and below that on the bottom left side it says 2 BootMii.
step 1 be able to load bootmii on your wii. then you can move on to casper
If you can not load bootmii, casper is not going to work because they are very similar. The bootmii folder can be made from the hackmii installer on your hacked wii if you like to try another bootmii folder. Delete sd:\bootmii and run hackmii. Under bootmii select install bootmii ios and prepare sd card. Bootmii should load, if not it may not like your sd card much.