today I spent a lot of time investigating the original YouTubeDS ROM to figure out what is missing and why my rebuilt version does not perfectly match the original.The good news: I was able to confirm that the ROM filesystem is not the issue. Using Tinke and ndstool, I extracted both the original ROM and my rebuilt ROM, then compared all of the files inside them. The fonts, keyboard assets, menus, logos, and other resources are identical.This means the problem is somewhere deeper: inside the compiled ARM9 binary.The original YouTubeDS ARM9 is around 447KB, while my rebuilt version is around 335KB. That missing size is not from assets or files — it is from the compiled code itself. Right now I do not know exactly what is different between the two builds, and without more information it is difficult to recreate the original binary.I have also been looking through the source code, build files, and compiler output to find possible causes, but the remaining possibilities are things like different compiler settings, missing build steps, or code that was present in Gericom’s original environment but is not available anymore.At this point, the biggest step forward is waiting for a response from Gericom. Since he created YouTubeDS originally, he may be able to provide information about the original build environment, missing files, or how the original ROM was produced.Until then, there is not much more I can safely change without risking moving further away from the original. The current goal is still to preserve YouTubeDS and make it usable again for InternetArchiveDS, since the original YouTube API it depended on shut down years ago.For now, the investigation continues — but we have narrowed the problem down from “the whole ROM is different” to “the compiled ARM9 does not match the original.”