Windows: Fujitsu-PCs after patch day dead
The Juni-Patch-Day update for Windows 10 22H2 has made numerous Fujitsu computers completely unusable. The devices get stuck at the start. Even BIOS access is no more possible. PCs can be saved with a special method.
Windows update bricks systems
Windows updates often cause problems. Most recently, Microsoft published new versions for Windows 11 and Windows 10 as part of the Juni-Patch Day. While there was already a subsequent update in Windows 11 to fix problems with gaming systems that had appeared through the update, the Windows 10 Update KB5060533 for version 22H2 seems to cause significantly more serious problems.
Owners of Fujitsu computers report that after installation and the mandatory restart, the computers get stuck at the Fujitsu logo and no longer start. It is particularly problematic that those affected can no longer even get to BIOS in order to change basic settings. The devices have become practically unusable.
Fujitsu Esprimo P556 Desktop-PCs are particularly affected, but also other models with various Fujitsu mainboards, including Esprimo X956/T, Q956, Q556 and models with the Mainboards D3444-A11, D3413-A1, D3403-A1x, D3402-A11, D3430-A1 and D3400-A1X. The problems were reported by numerous users in various online forums, social media platforms and the Microsoft Community.
Secure boot database as a problem person
Like Günter Born in his IT and Windows blog borncity reports, it is a problem with updating the Secure Boot database (DBX) through the Windows update. The problem probably occurs because the DBX file for the Secure Boot has grown from eight kilobytes to 24 kilobytes. This probably breaks down the storage space provided for processing and storage in the BIOS/UEFI of the devices concerned.
The DBX database contains signatures of firmware components that have been classified as unsafe and are therefore to be blocked in the Secure Boot process. Users suspect that the problem could be related to the CVE-2024-3052 security gap. Microsoft has set 14 variants of a signed firmware tool from the manufacturer DT Research on a DBX block list in the UEFI. Maybe something else may also be blocked in the DBX database, which is important for the Fujitsu devices.
BIOS recovery as a rescue
There is a temporary solution for affected users, even if their implementation requires technical skill and does not always seem to be crowned with success. Like user Gunnar Haslinger on his Blog reports, Fujitsu has installed a firmware recovery function for its mainboards, which can be used even without a functioning operating system. To do this, a special jumper must be implemented on the mainboard and a correctly prepared USB stick must be connected. The recovery procedure includes the following steps:
- Format a USB stick with the Rufus tool in Freedos mode
- Download the right BIOS file for the respective mainboard
- Convert the recovery jumper on the mainboard
- Start the PC with connected USB stick
- Reset the jumper after completing the recovery
The required BIOS files can be Fujitsu or the controversy are downloaded. On the FTP server from Kontron the files can be called up with the user name “Anonymous” without a password. It is important to know the exact mainboard name that should be printed on the mainboard.
Prevention for non -affected devices
If you have a Fujitsu computer that has not yet been updated, you should consider putting the update KB5060533 back on. Alternatively, the TPM module in BIOS/UEFI can be deactivated before installation, which, according to user reports, at least partially prevents the problem.
However, the deactivation of the TPM should only be regarded as a temporary solution, as this can impair important safety functions of Windows 10. This includes Bitlocker encryption and Windows Hello registration. Users should regularly check whether Fujitsu provides a BIOS update that permanently fixes the problem.
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