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how to upgrade existing BIOS [J61 Version 3.91] to run UEFI.

HP Recommended
Z420 work station Product # F9B37UC#ABA
Microsoft Windows 10 (64-bit)

Existing BIOS does not have option to boot and run in UEFI mode.  Are there any upgrades or drivers avalible for HP Z420.  The Z420 harddrive has GPT partitions.

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