Secure Boot & BitLocker Fixes: Everything You Need to Know About Windows 11 Update KB5083769

Microsoft has commenced the distribution of its April 2026 security updates across its product ecosystem. For Windows 11 versions 24H2 and 25H2, the cumulative update designated as KB5083769 has been released, primarily aimed at remediating a series of recognized systemic issues.

Users prioritizing a robust security posture are encouraged to procure and install the update immediately. However, as such deployments historically introduce nascent complications, those who value operational stability may prefer to defer installation until Microsoft has addressed any subsequent irregularities.

The salient features of this update include:

• Enhanced Telemetry: The update integrates higher-confidence device targeting data, which informs Microsoft’s determination regarding the necessity of UEFI Secure Boot certificate renewals.
• BitLocker Remediation: A fix has been implemented for an anomaly where certain devices erroneously entered Microsoft BitLocker Recovery mode following a Secure Boot update.
• SMB Optimization: The reliability of SMB compression via the QUIC protocol has been augmented, significantly reducing the probability of request timeouts.
• Anti-Phishing Fortification: Protective measures against phishing attempts initiated via remote desktop (RDP) files have been strengthened. The system will now manifest explicit security warnings and connection parameters upon opening such files.
• System Reset Restoration: The update resolves a failure in the “Reset this PC” functionality that emerged following the installation of the March patches.

Upon the successful application of KB5083769, users may observe notifications within the Windows 11 Security Center concerning UEFI Secure Boot certificates. Selecting the “Learn More” option provides critical insights regarding the impending certificate expiration.

This utility is designed to facilitate the transition to Microsoft’s updated UEFI certificates, as the legacy versions are slated to expire in June. Such expiration could impede the installation of future updates and, in extreme configurations, render the system unable to initialize. Consequently, Microsoft is deploying the new certificates in successive waves. The inclusion of these prompts in the Security Center serves to ensure users remain informed; however, should the update not yet be visible, users need not be alarmed, as the rollout is phased.

The offline installer may be acquired via this link.