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Fixes The following fix has been made in BIOS version 03.90: - Fixes an issue where system would not boot when cards with large MMIO are installed. Enhancements The following enhancements have been made in BIOS version 03.90: - This release improves security of UEFI code and variables and includes ... read more.
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HP Z420 Workstation BIOS 3.91 Rev.A full details