Messages

I'm not 100% where to post so I'm hoping someone can help me with this I have been using magic lantern for a couple weeks now and as of recently have been playing with the RAW footage that I see people posting about my only issue Is I am not sure how to make it 4k I see the option but when I go to it says camera cant support this with this mode I have seen tons of people give tutorials on youtube and have followed along and they dont have this issue they also have an option for crop video which I dont see. Thanks for any help?