Apple seeded a fourth test build of OS X 10.9.3 (13D28) to registered Mac developers, available through the Software Update mechanism in the Mac App Store as well as through the Mac Dev Center.
– Graphics Drivers
– Contacts and Calendar sync over USB in iTunes
Everyone else who is interested in testing OS X 10.9.3 (13D28) without being a registered Mac software developer can change their App Store URL by entering the following terminal command (all on one line):
sudo /usr/sbin/softwareupdate --set-catalog "https://swscan.apple.com/content/catalogs/others/index-10.9seed-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz"
You can restore to the original Apple catalog by resetting the override URL with help of the following terminal command:
sudo /usr/sbin/softwareupdate --clear-catalog
After that the CatalogURL property will be removed from /Library/Preferences/com.apple.SoftwareUpdate.plist and when everything went fine, you’ll see this text: softwareupdate: Changed catalog to Apple production
Back to the factory original (production) catalog.
Use of this confidential, pre-release software is subject to the Software License Agreement for Apple Confidential OS X Pre-Release Seed Updates presented upon installation of the OS X Software Update Seed Configuration Utility. The original Software License Agreement that accompanied commercially-available versions of the software being updated does not apply to these pre-release seed updates.
This update won’t show up under Updates in the App Store when you are still using the 10.9.2 Golden Master (build 13A598) or already have OS X 10.9.3 (Build 13D28) installed.
This build is said to fix previously introduced graphics issues for people stuck on a white/gray screen. Here it only worked when I plugged in a VGA cable. VGA output was garbled nonetheless, but at least DP/DVI/HDMI worked with 13D21. Others had to unplug their cable and plug it back in after a successful boot. Yeah. Crazy stuff.
Interesting. I found a new board-id (Mac-C9CF552659EA9913) for a new/unknown Mac model.
The rest is TBD (no time yet).