Welp. These might help:
www.reddit.com/r/DotA2/comments/228pct/how_do_i_change_dota_2_main_menu_background/
" ThatNotSoRandomGuy 1 point 12 months ago
As others here stated, you can do it by using the -dashboard launch option to set it to one of the predefined backgrounds.
If you want to set any image as background, you can do it by replacing the dota\pak01_dir.vpk\materials\console\background01_widescreen.vtf
Use GCFScape to open the vpk and VTFedit to edit the image. "
Does anyone know how to do this ? im not sure how can i use my created image to replace background01_widescreen.vtf.
EDIT:
nvm found this
http://steamcommunity.com/sharedfiles/filedetails/?id=206809519
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So yeah I customized my main menu background before..
and now I'm on a new PC and this happened. I don't know how to get it back to defaults.
anyone has an idea?