This method of using Seedminer for further exploitation uses your movable.sed file to write a custom save file for Steel Diver: Sub Wars, which can then be used to launch the Homebrew Launcher.
This process requires your console-specific movable.sed file. If you don't have it yet, you can get it by following seedminer. (Don't continue to BannerBomb3.)
If you already have Steel Diver: Sub Wars, this process will overwrite your game's save file!
What You Need
The game "Steel Diver: Sub Wars" (no longer available for download on eShop) installed on your device
Copy boot.firm and boot.3dsx from the Luma3DS .zip to the root of your SD card
The root of the SD card refers to the initial directory on your SD card where you can see the Nintendo 3DS folder, but are not inside of it
Copy the steelhax folder from the Steelhax-release.zip to the root of your SD card
Copy the otherapp payload for your region/version from the unSAFE_MODE .zip's otherapps_with_CfgS folder to the /steelhax/ folder and rename it to payload.bin
Reinsert your SD card into your device
Power on your device
Section II - Steelminer
Launch "Steel Diver: Sub Wars" once and select a Mii to initialize your save file
Decline the game update when prompted
If you have already updated the game, use the Data Management menu of the System Settings to delete the update