1. Open /S/L/E find AMD7000Controller.kext2. Right click and 'Show package contents'
3. Go to Contents
4. Copy Info.plist to your desktop
5. Edit Info.plist with text edit:
a ) Use find tool to find 0x68181002
b ) Replace 0x68181002 with 0x68191002
c ) Save file
6. Copy Info.plist back to kext content folder
7. Back in S/L/E find AMDRadeonX4000.kext
8. Repeat steps 2-5.
9. After all just Repair permissions and rebuild kextcache - I use Kext Utility.
Modified kexts attached. BTW I didn't save any vbios or modify it. It works with just those modifications.