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ATHR: unknown locale: 21


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The "ATHR: unknown locale: 21" isn't the issue. It's just a warning because OS X doesn't know what region your wifi card is from. Purely cosmetic. Based on that line about the bluetooth, it seems like it's stalling when trying to load graphics kexts. Someone else here might have a solution for that problem, but to fix the "ATHR..." error once you have everything booting properly, if you use Clover you can add the following within "KextsToPatch" in config.plist:

			<dict>
				<key>Comment</key>
				<string>Atheros Locale Fix</string>
				<key>Find</key>
				<data>
				g/s3
				</data>
				<key>Name</key>
				<string>AirPortAtheros40</string>
				<key>Replace</key>
				<data>
				g/sh
				</data>
			</dict>

Credit goes to "pista7" at the website-which-must-not-be-named for coming up with the fix.

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  • 3 years later...

For new Atheros kext in High Sierra above patch is no loner working. Just spent my day why? After dissembling kext binary file I found that new plugin now using EAX register instead of EBX. So new HEX byte for clover patch 

are:

FIND:    83F837

Replace: 83F821

Regards

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