i've had this issue with the stock firmware so i thought installing twrp with a prerooted image should do it, but the same issue appears. After the language and network setup, the update (searching for an update) goes wrong. I've got another 2 4k's here and they work, so it's not network related.
Installing twrp and the rooted image was quite easy, nice to see twrp running on these devices.
But does a lineage or another custom rom for the 4k actually exist? I think with a clean rom the error would be gone.
I don't know how to make lineage for this device, i. just know how to install it
I've attached an image, maybe someone has an idea.