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In case you didnt get the commands, they are here, type them in the same order as I put them.
mat_dxlevel 90
mat_hdr_level 2
mat_hdr_enabled
mat_fullbright 0
If you get checkerboards after all this, try typing mat_dxlevel 80 after typing in all the above commands, thanks to João Victor F. S. Fernande for the possible solution, also notify me on wether or not this worked for you.

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