To use Project M EX Remix (or similar mods), you must start with a clean, legally obtained Super Smash Bros. Brawl ISO

How to obtain and prepare a compatible Brawl ISO (legal, supported approach)

  1. Purchase an original retail copy of Super Smash Bros. Brawl for Wii.
  2. Dump the game from your own physical disc to an ISO using a home console mod or a compatible disc drive and software on a PC (e.g., CleanRip on a soft-modded Wii or other community tools). Follow local laws and device terms.
  3. Verify the dumped ISO is “clean” (no existing mods applied). Community guides specify the needed checksums or file layouts; follow the Project M installation instructions for the required ISO region/version.
  4. Apply the official Project M patch/installer following the Project M team’s documentation. Use the most current, official installer distributed by the Project M community.

Check the Hash: You can verify your ISO is "clean" by checking its MD5 checksum in Dolphin Emulator settings; common working hashes include d18726e6dfdc8bdbdad540b561051087. Setting Up Project M EX Remix (Dolphin)

Place the ISO: Move your Brawl ISO into the specific "Games" folder within your modded Dolphin directory.

Final recommendation: If you own a Brawl disc, rip it, build a Project M ISO, and enjoy the best competitive Smash experience on PC. Do not download pre-built ISOs from untrusted sources—they may contain malware and are legally risky.