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POST INSTALL: Please help to get working either AMD 8970m or 8650G

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Hello,
I have a laptop MSI GX70. Installed High Sierra a few days ago.

Configuration of my laptop is:
AMD A10-5750M CPU with integrated iGPU AMD 8650G (0x990B1002)
Discrete AMD 8970M graphics card (0x68011002)
8 gb RAM

The big problem for me for now is to configure any of graphics card's my laptop has. 

What I tried already:
For now I'm successfully booting using config.plist with injectATI. Seems to be both graphics adapters don't exist in system kexts. So, I modified AMD7000Controller.kext and changed there 0x68101002 (AMD Radeon R9 270X, AMD FirePro D300, AMD Radeon R9 M290X) to 0x68011002 and placed modified kext using Kext Utility. While booted into Clover, I used Deinit for iGPU and Inject ATI for 0x68011002. So, for now I have a line with AMD 8970M at about my Mac window, but picture quality is still poor so it seems to be all the same, it doesn't work.
Then I tried to do same things for iGPU - AMD 8650G. Modified kext AMD4800Controller.kext. Changed 0x944A1002 (AMD Mobility Radeon HD 4850) to my 0x990B1002. Inject ATI for iGPU - x990B1002 and Deinit for discrete. Same situation, poor quality picture, but unknown card at about my Mac window, "Display 7MB").

Also compiled DSDT, tried to disable discrete card, but may be I was wrong here - still no results.

I'm newbie. Is it possible to get discrete card working? And if not, integrated? Please, help. I really have no idea already.
Thank you!

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