Instead of trying to change the screen. Why don't you try to change a boring bit of text emedded in the navboot file.
Make it a very minor change. And then see if that is loaded ok i.e just swap one letter.
If this is rejected it shows the whole file is CRC checked somewhere. If it isn't rejected then either its just the gif thats CRCed or something more fundamental with the gif swapping.
It might help narrow down the search.
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