Chinese garage door code

Hi.! I just discovered this forum! I’m not good at English. But I can use Google to translate :sweat_smile:.
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

You should see if you can find the programming procedure for the garage door then have a look at this page.