4K not detected on Samsung 4K TV (fix, workaround).

I just got an XG1v4 and my old Samsung mu6300 could not sync to higher than 1080p, sucks, this TV has had issues with 4K sources. I tried the Roku ultra and it can sync at up to 4K 30 HDR10, so I experimented with the external device menu on the Samsung and I think disabling HDR Color for the HDMI input, now the TV syncs to 4K30 and 4K60. Could be an issue with the data rate with HDR.