I think the main difference between TR 2.0 and 1.0 is that 2.0 comes with an updated firmware. That said in my opinion the best modified firmware is the one for the Designare Z390 (NVM33) Found here:
Big Props @CaseySJ on 1,580 pages of high-quality technical jiggery-pokery. This thread must be pure gold for those with this motherboard wanting to get every ounce of performance and functionality out of it :thumbup:
www.tonymacx86.com
I know you are talking about the LG 5k but that said my Apple Studio display only worked right by doing the following:
Modified NVM33 ROM
3-5 Jumper to force Power
USB2.0 wire connected.
When I used the Thunderbolt header it did not work.
When I did not have the USB2.0 wire Connected it did not work.
Maybe with your board this might not be the case but with my z370 TR Rev1 it worked fabulous!
Also you could try using:
Getting to know the Belkin Charge and Sync Cable for HUAWEI VR Glass, CAZ001
www.belkin.com
It worked for the Studio Display but I liked the TB better maybe it was all in my mind.