Thanks, I was able to boot up Gecko but it suddenly freezes as soon as Brawl's menu pops up.

I've been wanting to go back into playing SSBB on Dolphin. But suddenly, I can't use Gecko anymore because of something about my Dolphin "using IOS 58". When I tried using the older builds of Dolphin I have, they also don't work. My other one says it's "Using IOS 9" and always "Error: No DVD Found" despite me setting Brawl as default ISO, then the other one suddenly saying about "invalid SYSCONF". I haven't touched my Dolphins since months ago.

I don't know what any of these means and there is no helpful guide about it.

The version is 1.40 from here: https://filetrip.net/wiiu-downloads/other-files/download-wiiscrubber-kit-with-multiloader-1-40-f4399.html. I dunno anything about the partition stuff.

Yes.

I've been wanting to have mods in SSBB and I've downloaded a few of them. However, no methods in putting mods in Brawl have ever worked for me.

I tried putting the mods in the SD.raw and using Gecko OS but I always received "Too Many Codes" error or something. I tried putting gameconfig.txt to the SD.raw but it only ended up putting more characters in the roster which will trigger infinite error pop-ups in Dolphin.

I've also tried the WiiScrubber but it only ended up making the ISO unreadable to Dolphin by saying that it's not a valid Wii game.