Issue with movie poster - The existing primary has been provided by a studio partner and is not editable.

https://www.imdb.com/title/tt7403614/

I was trying to change the primary poster to something else for the movie "The Big Trip (2019)", but I couldn't change it, even though it is a DVD product image and not an actual poster.

I want the old primary poster to be changed to this poster (or any other poster), so they can be set as the primary image:

https://www.imdb.com/title/tt7403614/mediaviewer/rm2762226945?ref_=ttmi_mi_all_pos_16