Made using Ocean-Flame: https://ocean-flame-nu.vercel.app/
Firmwares starting from V3.7.0 (the 512mb and 8gb split's beginning) cannot be loaded using the original Flame-Ocean (Win98-themed) webapp.
Ocean-flame also supports moving all images from one version to another, this one would have been made from the v3.9.0 version using the "move theme" function,
But it appears that v4.0.0 has changed some of the assets, so this one has been matched from scratch. However, there might be some mismatches, in that case, cross-check with source assets (src/fwmod-imgs) and stock images. 

Since I have the original 8gb model, I cannot test if this would work on an 512mb one as well, but as with every past release, you can see all source images in the `src` folder. 