Today I spent my time trying to bring YouTubeDS, an open-source Nintendo DS homebrew application created by Gericom, back to life. While I expected to spend most of the session coding, nearly all of my progress came from reverse engineering and troubleshooting an outdated development environment. I tracked down missing source files, resolved linker errors caused by an absent API key, and compared my rebuilt binaries against the original ROM to understand why they behaved differently.After digging through Makefiles, compiler output, map files, and the generated ROM headers, I discovered that the project was originally built using an older version of devkitPro and libnds. Modern releases automatically link against the newer Calico runtime, producing binaries that differ significantly from the original build and refuse to run correctly. I experimented with build flags, linker specifications, and library configurations before confirming that the real solution is recreating the original toolchain rather than patching the project itself.Although I haven’t produced a working ROM just yet, I now understand exactly why the project fails on modern tools. The next step is installing an older version of the Nintendo DS development environment so the application can be rebuilt as it was originally intended. Even though this was a debugging-heavy session, I made meaningful progress toward preserving and reviving an abandoned piece of Nintendo DS homebrew.