Hey
When I boot from USB's bootloader (unifail) my keyboard (not trackpad) works, once I installed the kexts in v3 (Acer V3-571G-6602) and boot from SSD, neither usb mouse, keyboard, or trackpad work. I'm downloading V4 now to try it.
I can dump a list of all of my kexts tommorow, and possibly add you on Skype if you are okay with that.
Thank you