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That worked for me on my HD 7770. Have 1920x1080 in both High Sierra and Mojave Beta 4. But... Only showing 7 mb video ram. SB 1024 So at least it gets you to the desktop... It's workable, but obviously not optimum.

Works perfectly. Was able to create an install file for High Sierra 10.13.5 For those having problems, please follow the OP's directions exactly as written.