Just as it says in the title.
More details: I have an older Vizio that I used with my Shield. I loved the experience until Google started feeding me ads at the top of my home page. So I sideloaded something else, created just a simple home screen with my most used apps and away I went, ad-free.
I just bought the X91J. Thought I'd give stock Google TV another crack. Its been 36 hours and I am already miserable. Besides the one big ad at the top, my home screen is filled with "top picks" and other "suggestions", which if we're being honest, are just more ads.
TLDR; Can I sideload a custom launcher on the X91J, the way I did with my Nvidia Shield ?
Yes you can