So this one i flashed while modding the 3790 i have to use:
[Only registered and activated users can see links. ]

Open that rgn with rgn_tool -> save the logo.bin -> open the logo.bin with gir_editor -> replace 800x480px with a custom one -> save logo.bin -> load the logo.bin back in rgn_tool -> save the rgn file -> flash in preboot.

Is that the right method? I dont have to make a 1024px custom image, just replace the 800px?