Windows 10 build 20251
| Build of Iron | |
 | |
| OS family | Windows 10 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 20251 |
| Build revision | 1 |
| Architecture | x86, x64, ARM64 |
| Build lab | fe_release |
| Compiled on | 2020-10-30 |
| Expiration date | |
| Timebomb | 2021-01-31 (+93 days) |
| SKUs | |
| Home (N, Single Language, China) Pro (N, Single Language, China) Pro Education (N) Pro for Workstations (N) Education (N) Enterprise (G, N) Enterprise LTSC Enterprise Evaluation (N) Enterprise multi-session IoT Enterprise Team | |
| Product key | |
| Use a Windows 10 Retail serial | |
| About dialog | |
  | |
Windows 10 build 20251 is the twentieth Insider Preview build of Iron, the 21H1 development semester of Windows as a service. This build was released on 4 November 2020 to all Windows Insiders on the Dev Channel. The Enterprise LTSC variant was shared on 21 November 2024.
Bugs[edit | edit source]
- Installing games downloaded from the Microsoft Store to a secondary drive that has no OS on it will result in the secondary drive becoming inaccessible. To prevent this bug from occurring, the default storage location for new content must be changed prior to installing the game. This can be done by navigating to Settings → Storage → Change where new content is saved.
- The update process to this build has a chance of hanging for extended periods of time.
- 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 randomly encountering a
DPC_WATCHDOG_VIOLATIONBSOD. - 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 Settings → System → Storage → 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. - Some screens incorrectly have black text on dark backgrounds when using the dark theme.
Gallery[edit | edit source]
Boot screen
The modern disk management page showing no drives present
