Sounds like the header is not allowing the controller to wake properly, and you may have to resort to the pin shorting method. NVM50 is something you run if you’re sticking to the DCH drivers, which are broken for Ryzen use. You need to flash NVM23 and use the older non-DCH driver as Wendell has detailed here:
You need to flash NVM23 with a Gigabyte supplied “FlashTbt” utility. There’s one on this thread: 2018 AMD X399 Threadripper 1950X [R1K,16C,X] + RTX 2080 @ 32Gbps-TB3 (Razer Core X) + Win10 [itsage] – Page 10 | External GPU Builds