Apple Updates OS X Mountain Lion Developer Preview to Build 12A206j - MacRumors
Skip to Content

Apple Updates OS X Mountain Lion Developer Preview to Build 12A206j

Apple today pushed out another update to its OS X 10.8 Mountain Lion developer preview program, moving to build 12A206j. The update comes on top of build 12A193i, which was released on May 1.

12a206j
Apple notes that "MacBookPro3,1", which corresponds to mid and late 2007 machines, is not compatible with the new build, but that issue will be rectified in a later build.

No other details on improvements in the latest build are available yet, but it certainly appears that Apple is making some of its final tweaks for developers leading up to its Worldwide Developers Conference less than four weeks away. Apple is expected to provide extensive previews of OS X Mountain Lion at the conference, with a public launch scheduled for "late summer".

The new Mountain Lion build is still a bit short of the 12A211 build spotted in a Geekbench entry for an apparently unreleased MacBook Pro earlier this week. While that entry could have been faked, the data does match closely with what is known about upcoming Ivy Bridge MacBook Pro models, and Primate Labs believes the entry to be legitimate.

Popular Stories

Apple Logo Gradient 16x9 1

Apple Just Made an Extremely Rare Product Announcement

Thursday August 27, 2026 7:58 am PDT by
The new Mac mini and Mac Studio models unveiled by Apple this week are the company's first new Macs announced in August since 2020. It is extremely rare for Apple to announce new products of any kind in August, excluding smaller things like new color options and accessories. As mentioned, Apple's last notable August product announcement was in 2020, when it updated the 27-inch iMac and a...
Surprise and Shine Feature

Apple Event Announced for September 9: 'Surprise and Shine'

Wednesday August 26, 2026 9:02 am PDT by
Apple plans to hold its annual iPhone-centric event on Wednesday, September 9 at the Apple Park campus in Cupertino, California. The event will begin at 10:00 a.m. Pacific Time, with select members of the media invited to attend. Subscribe to the MacRumors YouTube channel for more videos. The September 2026 iPhone event will see Apple announce the iPhone 18 Pro, the iPhone 18 Pro Max, and the ...
Apple Event Logo

Apple Unveiled Four New Products Today

Tuesday August 25, 2026 8:39 am PDT by
Apple today unveiled a new Mac mini with M6 and M5 Pro chip options, a new Mac Studio with M5 Max and M5 Ultra chip options, a new version of the Polishing Cloth with a lower price, and updated Magic Keyboards for Macs. To learn more about these products, read our coverage below: Apple Announces New Mac Mini With M6 and M5 Pro Chips and More Apple Unveils New Mac Studio With M5 Max and M5...

Top Rated Comments

186 months ago
LOL @ Retina display. Thats exactly what every developer wants! They want a resolution so high that they will need an external graphics card to be able to run the display.

Is this real life? Release more info for developers and allow us to program on Windows so we don't have to buy overpriced laptops with sub-par components...
Why don't you go pickup a pc, put DOS or Linux on it & hook it up to a CRT monitor and you can enjoy the power that will crackle out of the crevices of your "power-user" system to p0WN all the things with EZ.
Score: 18 Votes (Like | Disagree)
Shrink Avatar
186 months ago
Pfft. What a joke. Hurry up apple, you corrupt company! With all that liquid cash you would think they could pull this out early. What a joke.

Posted from my Droid Razr Maxx (HeHAW)
You're absolutely right. Obviously Apple is not spending enough money to develop ML just because they're cheap.

Apple's corruption and frugality is what is delaying the release of ML.

You're so perspicacious in pointing out that they should release it sooner. All that bull crap about about proper testing and de-bugging so we get a smooth running OS with a minimum amount of bugs and glitches is just Apple's corruption and refusal to spend any money on hiring enough developers to get ML out sooner.

Boy, I'm glad somebody finally told the truth about all this.

Thanks for your eye opening post.

:rolleyes:
Score: 16 Votes (Like | Disagree)
pgiguere1 Avatar
186 months ago
Ahh...The irony...


The ICDocument icon..iCloud document..

People will get over it, and we'll probably keep seeing the Ethernet plug as an icon for Internet for a while, even if it gets outdated on laptops, simply because it's very representative networks and the Internet.

After all, we're still saving by clicking on a floppy icon, Mail's icon is a stamp, Logic's icon is a vinyl record, Page's icon is a dip pen, Safari's icon is an analog compass, Find my iPhone's icon is an old-school radar and the iPhone's phone app icon looks like a wired phone from the 80s, just to name a few...
Score: 14 Votes (Like | Disagree)
djrod Avatar
186 months ago
LOL @ Retina display. Thats exactly what every developer wants! They want a resolution so high that they will need an external graphics card to be able to run the display.

Is this real life? Release more info for developers and allow us to program on Windows so we don't have to buy overpriced laptops with sub-par components...

I don't want to develop in a sub-par OS :rolleyes:
Score: 12 Votes (Like | Disagree)
Shrink Avatar
186 months ago
This wait is getting a bit ridiculous though. I can't even remember when Lion came out, but I'm pretty sure it was mid-2005. Since then Microsoft have launched two updates to Windows. So there!
Lion...2005!!!???:confused:

Boy, you really got me with that "So there!"

A razor edged riposte.

:rolleyes:
Score: 10 Votes (Like | Disagree)
Sky Blue Avatar
186 months ago
So Apple didn't update OS X Mountain Lion Developer Preview to Retina Display build? I'm surprised.

Why would they do that?
Score: 9 Votes (Like | Disagree)