It’s really strange.G1 can work .4pro not. 
Kinhank G1 - #395 by Hassan
Same SOC ,Same wifi chip
3 Likes
I’ve did some work for the box, and give up now. But I’d like to share my work, to help you or someone else might solve this problem.
Here is the information:
1、NG can support AP6275P, at least pcie is link up, the log can be found in Kinhank G1 topic.
2、PCIE reset gpio is 0x35, it’s comfirmed by measuring hardware signal, no other difference found for now.
3、Auraro 4 pro with ne support AP6275P, it means the hardware is supported, even though not using the right PCIE reset GPIO it can bootup. So modify PCIE reset gpio is not the key point.
4、I’ve found PCIE module source code for NG and NE system had lots of differences. This may cause compatibility issue.
For the information above, I think maybe factory BOOT based on NE code did something to PCIE, and then ng coreelec bootup with uncompatible setting, caused pcie peripheral no response. Maybe a global reset for the whole pcie peripheral asserted before loading pcie module is needed? I don’t know.
Here is some other information:
Auraro 4 pro drive 3 leds using IC TCA6507 from TI, this can be seem both in android dtb and on the board.
A module for this IC is needed to make led work.
No other hardware difference found.