[Update]
The Android 5.0 Software update for AT & T LG G3 D850 is available now.
This software update includes:
Update to Android 5.0 (Lollipop)
Google setup wizard (R2G removed)
Stability improvements
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Software Verison: D85020f
Android OS Build#: LRX21Y
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Good news for AT&T LG G3 owners! The Android L 5.0 Update for AT&T LG G3 D850 should be coming soon.
A few days ago, we seen the South Korean version of the LG G3 with the new Android L 5.0 platform on HTML5TEST website. Last night, The Android 5.0 L firmware Ver. D85520A/build LRX21M for international G3 D855 was leaked at XDA forum.
Now, the AT&T variant of the G3 D850 running Android 5.0 Lollipop was spotted on HTML5TEST site. According to the site the Browser (Chrome 38) on a LG G3 D850 running Android 5.0 Build LRX21M SCORED 525 OUT OF 555 POINTS.
As mentioned in the Browser User agent String, The firmware loaded on the AT&T LG G3 is based on Android 5.0 build LRX21M, which is the same build number as the current Nexus 9 firmware.
It looks like LG engineers are testing the Android 5.0 Firmware for the AT&T G3 D850. The firmware is almost the final build – LRX21M, So AT&T LG G3 owners should receive the Android 5.0 update soon.
Stay Tuned
Source: http://html5test.com/s/b0853923b8c48d7d.html