The audio is working when I use BIOS 1.5.3 and your E7x70_Sierra.zip.
After I update BIOS to 1.12.3, the macOS could not find wireless, ethernet adapter and audio.
And then I try to downgrade to 1.5.3, it show me: ME Firmware EndUpdate Failed Error: 0x00002200.
My current version is 1.12.3
DSDT/SSDT was extracted from 1.12.3
Working: sleep, wireless, bluetooth, ethernet adapter
The audio still not working, after repair permission and rebuild cache.