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What tool can replace the texture behind Mario's head?

SM64 ROM Manager claims the "Super Mario 64" texture that is tiled for the "Press Start" screen behind the 3D Mario head is "read only". Surely something can replace it?
Try using Texture64. I heard that works well.
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IS THAT YOUR FINAL ANSWER?
Sadly haven't been able to find that texture in Texture 64, but thank you for the suggestion. Weird that that one and the "Game Over" texture seem to be the only ones that are read only in ROM Manager.
Have you tried doing it in N64Rip? It's an old program, but I've been able to edit those textures with it.
we just don't know