Table of Contents
- What Steps Fix the Critical Windows Update Issue Bricking Fujitsu Esprimo P556 Devices?
- Technical Details
- User Reports and Scope
- Workarounds and Recovery Steps
- Solution 1: Reset BIOS/CMOS
- Solution 2: BIOS Recovery
- Solution 3: TPM Management
- Solution 4: Secure Boot Keys
- Prevention and Recommendations
- Key Takeaways
What Steps Fix the Critical Windows Update Issue Bricking Fujitsu Esprimo P556 Devices?
Numerous Fujitsu Esprimo P556 desktop computers have become completely non-functional (“bricked”) after installing the June 2025 Windows security updates, specifically update KB5060533.
Affected systems freeze at the Fujitsu logo after reboot and cannot access BIOS or UEFI, making standard recovery impossible.
The root cause appears to be a problematic update to the Secure Boot DBX (forbidden signature database), which expands the DBX file size beyond what the system firmware can handle, resulting in firmware corruption.
Technical Details
The Esprimo P556 is an office desktop, typically equipped with Intel i3–i7 CPUs and compatible with Windows 7–10, and sometimes Linux.
The update manipulates the Secure Boot DBX file, increasing its size from 8KB to 24KB, which likely exceeds the memory allocation in the firmware, causing the update to fail and brick the device.
The issue is tied to Secure Boot and Trusted Platform Module (TPM) settings. If TPM is enabled after the update, the system remains unusable. Disabling TPM allows the PC to boot, but this is not a permanent fix.
User Reports and Scope
Multiple users and IT professionals have reported dozens to hundreds of affected Fujitsu Esprimo P556 units across Germany, Italy, and Slovenia. Other Fujitsu models, including some All-in-One X systems, may also be impacted.
Workarounds and Recovery Steps
Solution 1: Reset BIOS/CMOS
- Disconnect power and remove the motherboard battery for several minutes to reset CMOS data.
- Reconnect and attempt to boot. If TPM is disabled in BIOS/UEFI, the system may start.
Solution 2: BIOS Recovery
- Download the correct BIOS update files for your model from Fujitsu’s official support site or trusted vendors.
- Use a USB flash drive and follow the manufacturer’s BIOS recovery procedure. Some users have had success restoring bricked systems this way.
Solution 3: TPM Management
- If the device boots after BIOS reset, keep TPM disabled to avoid recurrence of the issue.
- Be aware that clearing or resetting TPM will delete all keys, potentially causing data loss if disk encryption is used.
Solution 4: Secure Boot Keys
Advanced users can consider clearing Secure Boot keys and manually reloading them, but this is complex and not recommended for non-experts.
Prevention and Recommendations
- Do not install the June 2025 Windows updates (especially KB5060533) on Fujitsu Esprimo P556 or similar models until a fix is available.
- If updates are required, ensure you have a full system backup and access to BIOS recovery files before proceeding.
- Monitor Fujitsu and Microsoft support channels for official patches or updated guidance.
Key Takeaways
- The June 2025 Windows update can render Fujitsu Esprimo P556 computers inoperable due to Secure Boot DBX update errors.
- Recovery is possible in some cases with BIOS reset and firmware reflash, but requires technical steps and may not always succeed.
- Disabling TPM and avoiding the problematic update are the most reliable ways to prevent this issue until an official solution is released.
This situation highlights the importance of cautious update management, especially for older hardware no longer actively supported by manufacturers.