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Thanks for the file. When I try to install this for my hd4850 with kext utility app The screen flickers and VLC doesn't work. I had to re install sierra to get back to non flickering screen. My main problem is I am using late 2009 iMac 27 and my pointer started to freeze, I searched that problem and learned it is caused because of the hd4850. That is the reason I am trying to download this kext. Thanks again.

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HACK
 
Clover:
|

|->Devices->FakeID->ATI: 0x94401002

|

|->Graphics->

| | FBName:motmot

| | VRAM: 1024

| | VideoPorts: 2

| |_ Inject: ->

| |_ ->ATI: Yes

|->KernelAndKextPatches->

in HEX format plain:
 
Comment: ExoticP (48xx) Sierra 10.12.x p1
Name: ATIRadeonX2000
Find <ff83 f93f>
Replace <ff83 f93a>
 
Comment: ExoticP (48xx) Sierra 10.12.x p2
Name: ATIRadeonX2000
Find <0f 83870000 00>
Replace <90 90909090 90>
 
in Base64 format config.plist:
<dict>
				<key>Comment</key>
				<string>ExoticP (48xx) Sierra 10.12.x p1</string>
				<key>Find</key>
				<data>/4P5Pw==</data>
				<key>Name</key>
				<string>ATIRadeonX2000</string>
				<key>Replace</key>
				<data>/4P5Og==</data>
			</dict>
			<dict>
				<key>Comment</key>
				<string>ExoticP (48xx) Sierra 10.12.x p2</string>
				<key>Find</key>
				<data>D4OHAAAA</data>
				<key>Name</key>
				<string>ATIRadeonX2000</string>
				<key>Replace</key>
				<data>kJCQkJCQ</data>
			</dict>
-----
 
MAC 
 
or if you prefer hard patch, use this command in terminal and add your device id to atiradeonx2000, amd4800Controller kext. eg. 4890 id 0x94601002
 
Patch:
sudo perl -pi -e 's|\xFF\x83\xF9\x3F|\xFF\x83\xF9\x3A|; s|\x0f\x83\x87\x00\x00\x00|\x90\x90\x90\x90\x90\x90|' /System/Library/Extensions/ATIRadeonX2000.kext/Contents/MacOS/ATIRadeonX2000

device-id

i would do this 

sudo nano /System/Library/Extensions/ATIRadeonX2000.kext/Contents/Info.plist

 

ctrl+w (search 9440) add 0x94601002 ctrl+x save yes.
same for 4800 controller
sudo nano /System/Library/Extensions/AMD4800Controller.kext/Contents/Info.plist
ctrl+w (search 9440) add 0x94601002 ctrl+x save yes.
 
------
 
rebuild kernel cache (kext utility), disable SIP (System Integrity Protection), fix framebuffer patch if using HDMI....
 

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