@dankcushions
Think so (/home/pi/.cache/mupen64plus/cache)and it need to be a htc file i guess ?
But still didnt get it too work.
Hope soon...

@Wookums
Thanks a lot
will try it soon :)

@Ranma Remember to turn off less accurate blending for this game as well. There are visual glitches if its turned on.

I came across this same problem today. I know this post is getting old, but hopefully this answer is useful to others who have the same problem.

To clear the cached HiRes Textures, navigate to: /home/pi/.cache/mupen64plus/cache/
delete the file: <ROM_Name>_HIRESTEXTURES.htc
Where <ROM_Name> is the name of the ROM you want to clear the cached textures.

Say for example you wanted to clear the high resolution textures for Super Mario 64,
rm /home/pi/.cache/mupen64plus/cache/"SUPER MARIO 64_HIRESTEXTURES.htc"

-LedHed