Teranex Rollback

Is it possible to rollback the software from 6.1 to 5.0? A factory reset doesn't work.

I'm having an issue with the HDMI input. Via HDMI from a 13" MacbookPro, the Teranex only sees 4K input, regardless of what I change in the display settings on the mac. 1080 would be ideal.

Any help is appreciated.

Thank you!