Hi.! I just discovered this forum! I’m not good at English. But I can use Google to translate 
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Currently I have a garage door with a brown YH controller(maybe made in china). I tried to reinstall the RF code so I could use it, but I didn’t have the key. Can only be started with 3 buttons fixed to the wall.Can anyone help me with some playable files with the “.sub” file extension, thank you!
Sorry I can’t download photos from my phone gallery because of an error
This is an image that can be searched on google
https://www.google.com/search?q=garage+door+controller+YH&tbm=isch&ved=2ahUKEwjPgtWm58iCAxX2avUHHdT_DloQ2-cCegQIABAD&oq=garage+door+controller+YH&gs_lcp=ChJtb2JpbGUtZ3dzLXdpei1pbWcQAzIFCAAQogQ6BwgAEBMQgAQ6CAgAEAcQHhATOgQIABAeOgYIABAFEB5QmwZYmBNgyBdoAHAAeACAAWWIAfYCkgEDMy4xmAEAoAEBwAEB&sclient=mobile-gws-wiz-img&ei=gDFWZc_CF_bV1e8P1P-70AU&bih=731&biw=393&prmd=isvn#imgrc=3Up_CD8J0RBNWM&imgdii=g_PBAKo0DYvkTM
You should see if you can find the programming procedure for the garage door then have a look at this page.
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