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NexPostFacto for OS X 10.9 on Unsupported Macs (ATI X1xxx GPUs only)

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Current version: 1.0b6 (2020-06-29)

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NexPostFacto 64-Bit ATI 10.9 Beta
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The world's first program to install OS X 10.9 with working GPU drivers on unsupported Macs!

Supported Macs
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iMac4,1 (if CPU upgraded to Core 2 Duo)
iMac5,1
MacBookPro2,1 2,2
Xserve1,1 2,1
MacPro1,1 2,1 (with X1900 XT)

Instructions
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Format an 8GB+ USB, or hard drive partition, as Mac OS Extended (Journaled)
Extract the zip and open Terminal. cd to the directory created
Run: ./oipatch.sh /path/to/Install\ OS\ X\ Mavericks.app /Volumes/USBOrPartitionNameHere
You MUST select Y to erase the partition or the script will not work!
IMPORTANT: This script does not work if run on an already created installer USB, or if your installer is very small and does not contain the full operating system. It only works on the full, multi-gigabyte installer app.

Boot from the USB or partition, install OS normally.

AFTER all OS AND security updates, install the mavlegacygfx.pkg that was copied onto the installer drive. If you accidentally install it before doing updates, the Finder will not open!

Notes compared to normal 10.9
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Photo Booth lags
Find my Mac and FileVault do not work because they require a recovery partition
Spotify has graphical glitches making it unusable if hardware acceleration is enabled (disable it in the menu)
When you minimize some windows which use hardware acceleration such as web browsers, horizontal yellow lines will appear during the minimize animation
Overlays of hardware accelerated video (like YouTube controls) flicker rapidly

Thanks
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MacPostFactor for the idea (but none of the code)
random_user_online for inventing the name
tiamo for boot.efi
All the testers (see the About app for credits)