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BugZero found this defect 165 days ago.
The customer may be unable to configure BlockBootUntilChasIntrusionClr with a return code of 2. The setting may not be changed. Affected Platforms: Latitude 9450 2-in-1
This is due to the coding issue.
Updating to BIOS version 1.9.1 or later on the computer resolves the issue. To download and install the BIOS, reference Dell BIOS and UEFI Update Download and Installation Guide.