Need Help With Conversion and Upscale or any advices

[monke.gus]

Hi everyone,

I'm trying to upscale the campaign textures in Black Ops 1, but I've run into a big issue: the game has no sound anymore after my changes.
Here’s what I did:

I unpacked the texture archives iw_01.iwd to iw_14.iwd using WinRAR.

I extracted the .iwi texture files and converted them to .dds (with IWI DDS Fast Converter).

Then I converted .dds to .png to upscale them using Real-ESRGAN.

After that, I converted the .png files back to .dds (with XnConvert), then back to .iwi.

I repacked everything into .iwd files, keeping the same folder structure (/images/), and replaced the original .iwd files in the game folder with my new upscaled versions.

Now the textures look fine in-game, but there’s no sound at all.
This is my first time doing a project like this, so I probably missed something.

Did I accidentally remove or overwrite sound-related files?
Should I have made a new .iwd (like zzz_upscale.iwd) instead of replacing the originals?
What’s the correct way to inject upscaled textures without breaking the rest of the game?

Any help or advice would be really appreciated!

Thanks in advance.

[monke.gus]