It's strange you can see the technical info but not the picture. Means HDMI signal is present. Are you 100% sure the three tiny ribbon connectors of HDMI board are all correctly connected and secured with little retainers closed?
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When I installed my hdmi it did not work. My supplier said the rc may need a update. It did but I had not waited for the message before going to camera in GO, now all works fine.
I got the FPV workin, had to reinstall firmwere after I put the hdmi module on. Works awesome supper fun, now I can take someone flying with me[emoji106][emoji106][emoji106][emoji106]