Help HDMI on android tv box not working

Brought a justop android tv box. Set it up on the upstairs tv hdmi worked fine took it downstairs for abit and worked fine but now ive took it back upstairs and HDMI wont respond on that TV anymore.

This seems to have happened after I updated the given official firmware. Only problems is Ive re flashed with stock rom and same problem aswell. The av feed works fine in the tv and ive tried other hdmi cables to no affect. The weird thing is the hdmi sockets work fine as I tried xbox etc and they work fine.

so to clarify aswell I have tried the box on other tv's and still works fine via HDMI. But not the original one it used to work on. Please HELP

Minnddd is boggled.

Thanks in advance

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