Windows 10 build 20277

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10.0.20277.1.fe_release.201207-1545
Build of Windows 10 Iron
10.0.20277.1.fe_release.201207-1545
OS family
Architecturex86, x64, ARM64
Compiled2020-12-07
Timebomb2021-10-31 (+328 days)
Works in
About
20277 winver.png
SKUs
Home
Home China
Home N
Home Single Language
Pro
Pro N
Pro Single Language
Pro China Only
Pro Education
Pro Education N
Pro for Workstations
Pro N for Workstations
Education
Education N
Enterprise
Enterprise Evaluation
Enterprise G
Enterprise G N
Enterprise multi-session
Enterprise N
Enterprise N Evaluation
IoT Enterprise
Team
Key
Use a Windows 10 Retail serial
TCB.png TCBGallery.png

Windows 10 build 20277 is the twenty-fourth Insider Preview build of Iron. This build was released on 10 December 2020 to all Windows Insiders on the Dev Channel along with Cobalt build 21277.

Bugs[edit | edit source]

  • At the time of release, the update process had a chance of hanging for extended periods of time when attempting to install this build.
  • Live preview doesn't work for pinned site tabs on some machines, a gray window is seen instead of the intended content.
  • There's a chance of encountering an error with the error code 0x80070426 when using a Microsoft account to sign into certain apps. If this bug is encountered, it can be usually fixed by restarting the system.
  • The modern Disk Management page located at SettingsSystemStorage → Manage Disks and Volumes in the Settings app is completely blank, and as a result it will not display any drives present on the system. To workaround this issue, use the legacy Disk Management tool (diskmgmt.msc) to manage disk drives.

Availability[edit | edit source]

Windows Update Settings showing this build downloading and Cobalt build 21277 being offered at the same time

Starting with this build's release, the Dev Channel went under a temporary splitting of released builds. While the channel still received mandatory updates from this version, builds from the Cobalt development cycle would be released at the same time as optional updates, giving Insiders the ability to choose to keep receiving Iron builds or moving forward. For this case, the accompanying Cobalt build was 21277.

Gallery[edit | edit source]

External links[edit | edit source]