Thanks though. The thing makes me feel really confused is that whatever vbios and cpu being used, the graphic card get the same Hardware ID, but on the same time only MSI vbios can make driver works under 9400f. The only difference between 7700t and 9400f platform is the altered device instance path, as it shows below.

7700t: PCI\VEN_10DE&DEV_1BA1&SUBSYS_141319DA&REV_A1\4&39596A30&0&0008
9400f: PCI\VEN_10DE&DEV_1BA1&SUBSYS_141319DA&REV_A1\4&8F11CFA&0&0008

The other problem is graphic card fan will gradully speed up after powered on, finally the computer will shut down when the fan speed reached at a very high level (probably maximum I guess), this happens only when the driver can't be loaded successfully. Actually there were several times the driver can't be loaded under 7700t as well, but this situation only happens when I insert the 7700t right after removing 9400f everytime, but after restarting the system it goes away.

I feel like that would be my very last time to struggling with a test clip, believe it or not I almost spent all the passed 2hours on clipping the flash chip to burn the MSI vbios back, but still failed at the end. I'm going to buy a test socket which can be soldered on the grahic card board then do more possible test.

Hope you can get the socket soldered in easier than fighting the clip! Maybe by time it arrives Sylar76 or someone else will have more vBIOS for you to test

I noticed in the vbios provided by @Sylar76, all the missing part in the original Zotac vbios have been added, but unfortunately the driver stll didn't work as you guys have already known. Since I still want to figure out the reason, I searched on the internet and found a Nvidia official document about vbios content (Link: https://download.nvidia.com/open-gpu-doc...tion-Table.html). During reading this document, though I don't really understand the terms they used since I have no hardware/software development background, the description of PCI Expansion ROM still drew my attention. Just wonder if there is a possibility that the operation of driver partially depends on the PCI Expansion ROM, where Zotac original vbios lacks support to coffee lake cpu while MSI did a good job. Please let me know any potential reason of this situation, I'd like to do more test, basically for perfection of my PC. Thank you!

I've been having similar troubles with a Zotac EN1080k. Running fine with a modded BIOS and an i7-7700; error 43 with an i7-8700.

The closest equivalent Coffee Lake system I've found is the ASRock Desk Mini (Z370/Z390) which comes with a GTX 1060, 1070, or 1080 and supports Coffee Lake CPUs. It has two DisplayPort and one HDMI output, so it may be a better match than the MSI vBIOS. If the vBIOS for the Desk Mini can be found, it may be compatible or help with figuring out what is missing in the Zotac vBIOS.