HOW TO GET IT:
• If your console is in Instant-On mode and you have been selected to receive the update, it will download and install the update and reboot to standby.
• NOTE: Once the update is available to you, you can manually begin the update by launching the Guide and navigating to All Settings > System > Updates.
• If your console hasn’t downloaded and installed the update by 1:00 AM PST 1/26/2018 (9:00AM GMT 26/1), you will be prompted to do so at that time.
• This update has a shorter than usual amount of time before it becomes mandatory.

DETAILS:
OS version released: rs3_release_xbox_dev_1802.180121-1921
Available: 6:00PM PST 1/25/18 (2:00AM GMT 25/1)

FIXES:
• System Setup – Kinect
When setting up a Kinect during the initial console set-up experience, the setup no longer fails when tuning audio.
• Network Transfer
The network transfer no longer fails when initiated from a console on 1802 (this update).

KNOWN ISSUES:
• Profile
Some users are seeing a new issue which can cause the incorrect profile color to display after powering on the console.
• Pseudo-Localization
You may notice strange characters which replace normal translated text on the dashboard, Guide, and other areas. Please use Report a problem when you encounter these issues.
• Games Installation
Games that are installed fail to launch.
Workaround: If the games are installed to an external drive please copy the game to the internal drive or attempt to delete the title and redownload to fix the launch error.
• Display
We are investigating the inaccurate RGB colors that have been reported when displaying in 4K HDR mode when playing a UHD disc.
• Tournaments
• The left and right navigation for selecting date and time during Tournament creation is currently reversed when the console language is set to Arabic or Hebrew.
• Left and right navigation in Tournament twists is reversed when the console language is set to Arabic or Hebrew.
• Left and right navigation in the bracket view of Tournaments is reversed when the console language is set to Arabic or Hebrew
• Avatars on Home
Users wishing to represent themselves as an avatar can do so by changing their settings under My profile > Customize profile > Show my avatar.

Source: January 25th: New Preview BETA build available (1802.180121-1921) | Xbox Forums

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Posted By: Brink
25 Jan 2018