I previously rooted and flashed Siyah 4.3.3 which resolved my issue with the sleep of death. This seems to prevent this new update from installing as when the phone reboots it shows the Siyah boot image and then boots back into the OS, when I unlock the phone it tells me that the update failed to install. I'm not in a hurry to install an update that resolves something I've fixed through other means, but I thought I'd share for those interested.
As some of you have already noted, an update is available for the Samsung Galaxy SII.
The update includes fixes for devices that may become unresponsive and/or power down while sitting idle on rare occasions. It also enhances security to protect against malware vulnerability. You will receive a notification on your phone to update.
NOTE - You must have updated to Android version 4.0 to receive notification of the new software update
From community manager on ATT forums:
Just got am s2 i777 for my wife. Its stock and still on GB. Its factory unlocked and were on T-Mobile (t-maybe). I would root it and custom ROM it but its the wife's .
Is the only way for me to update through kies? Because kies is crashing on my PC right now.
Sent from my SGH-T679 using xda app-developers app