21/10/2025
Windows 11 24H2 / 25H2 Update – October 21, 2025
Out-of-Band Hotfix (KB5070773): Fixes, Improvements, and BSOD Resolution
Overview:
• Released as an Out-of-Band (OOB) patch: KB5070773
• Applies to Windows 11 versions 24H2 (Build 26100.6899) and 25H2 (Build 26200.6899)
• Purpose: Address severe issues from the October 14, 2025 Patch Tuesday update (KB5066835)
• Type: Stability and reliability fix (no new UI or feature updates)
Issues Caused by October 14, 2025 Update:
• BSOD (Blue Screen of Death) errors: ‘UNSUPPORTED_PROCESSOR’, ‘INACCESSIBLE_BOOT_DEVICE’
• WinRE (Windows Recovery Environment) bug – USB keyboards and mice stopped working
• Boot loops and crashes, especially on Copilot+ and ARM64 devices
• Driver signature and recovery partition mismatches
Improvements and Fixes:
• Fixed BSOD and boot loop issues introduced by KB5066835
• Restored USB input functionality in Windows Recovery Environment (WinRE)
• Corrected driver signature mismatches that caused system instability
• Enhanced update reliability and system recovery handling
• No new UI, Copilot, or visual enhancements – backend stability only
Conformation: BSOD Issue Resolved
• Microsoft’s release notes confirm that KB5070773 resolves BSODs from KB5066835.
• Telemetry data post-release showed a significant drop in system crashes.
• Users confirmed improved boot stability across Intel, AMD, and ARM systems.
• Verified by multiple tech sources: Windows Latest, Tom’s Hardware, BleepingComputer.
Summary:
✅ BSOD and WinRE issues – FIXED.
✅ System stability – IMPROVED.
❌ New features or UI updates – NONE.
This hotfix ensures a smoother, more reliable experience for users on Windows 11 24H2 and 25H2.
