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Legacy mode after BIOS update

Elitebook 8470p
Microsoft Windows 10 (64-bit)

Hello,

 

Recently I have decided to update the BIOS in my EliteBook 8470p. However, after installing newest BIOS 68ICF F.64 Legacy mode has stopped working. Bios uploaded correctly without any errors.


When I attemp to boot up in Legacy mode, below message appears:


"Boot Device Not found
Please install an operating system on your hard disk.
Hard Disk (3f0) "


After a while, the laptop restarts and the situation repeats itself.


Legacy mode worked without any problems before this BIOS update. At this point, the system can start only by selecting UEFI Hybrid (with CSM) or UEFI Native (without CSM).

 

System: Windows 10 Professional 64-bit
Drive: SSD A-Data SP900 128GB

 

Do you have any ideas how to run Legacy mode?

 

Thanks for the help

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