Windows 10 build 21301.1000

Build of Cobalt
Architecturex86, x64, ARM64
Compiled on2021-01-23
Expiration date
Timebomb2021-10-31 (+281 days)
Home (China, N, Single Language)
Pro (China Only, N, Single Language)
Pro Education (N)
Pro (N) for Workstations
Education (N)
Enterprise (N, (N) Evaluation, G (N))
Enterprise multi-session
IoT Enterprise
Product key
Use a Windows 10 Retail serial
About dialog
21301 Winver.png
TCB.png TCBGallery.png

Windows 10 build 21301.1000 is the fifth Insider Preview build of Cobalt, the 21H2 development semester of Windows as a service. This build was released on 27 January 2021 to all Windows Insiders on the Dev Channel.

Changes[edit | edit source]

Some of these changes are only available to a small group of Insiders, meaning that not everyone will see them right out of the box, and will roll out to the rest of Insiders soon.

  • Touch keyboard improvements:
    • When undocking the keyboard in 2-in-1 devices, it now switches to the Small keyboard layout, and it can be easily moved the keyboard around using the gripper region at the top of the flyout.
    • Small and split layouts will now feature an updated symbol's view based on the default layout.
    • A password feedback icon has been added to the left of the space bar on password fields to turn on visual key press feedback on the keyboard.
    • The default keyboard layout on 12” or larger screens has been updated with the keyboard having a more traditional keyboard layout featuring Esc, Tab ↹, and ⊞ Win keys and other minor tweaks.
    • The N’Ko keyboard layout has been updated to support access to currency and some other symbols by tapping the keys along the top row of the keyboard while holding the ⇧ Shift key.
  • When locally saved files are right clicked in taskbar jump lists, the Open file location option now appears in addition to just Open.
  • The touchpad on/off toggle under Settings → Devices → Touchpad no longer requires administrative privileges to be configured.
  • Backend dictionaries have been updated to help improve spellchecking and text prediction relevance.
  • The redesigned window animations introduced in build 21277 are now a bit faster.

Bugs[edit | edit source]

News and interests[edit | edit source]

  • The taskbar button's layout is reset to "Show icon and text" after upgrading to this build.
  • Sometimes the flyout cannot be dismissed with pen.
  • The taskbar button can show stale information each time users log into their account.
  • The flyout shows content in a single column before quickly switching to double column.
  • The taskbar button's text can look pixelated in high resolution screens.
  • Attempting to share content dismisses the flyout.

General[edit | edit source]

  • The update process to this build has a chance of hanging for extended periods of time.
  • There's a chance that the upgrade process to this build may fail with an IRQL_NOT_LESS_OR_EQUAL BSOD.
  • The reliability of the Start menu and other modern apps may be affected in this build.
  • Miracast users may experience very low frame rates in this build.
  • Live preview doesn't work for pinned site tabs on some machines, a gray window is seen instead of the intended content.

Gallery[edit | edit source]

External links[edit | edit source]