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JoeAus
Paper Tape
Posts: 2
Registered: ‎08-07-2014
Location: Australia
Views: 66,503

Unable to select UEFI/Legacy Boot in BIOS / Startup - ThinkPad T540p

I bought a ThinkPad 540p that comes with preloaded Windows 8.1. As I want to dual boot the machine I tried to select the Legacy Boot option in the BIOS/Startup tab, but I can't do anything as the option UEFI/Legacy Book is greyed out and locked in "UEFI Only". Below it there is an option called: -CSM Support that is also greyed out and selected as [No]. (below  these options there is a little note with an asterisk saying "Unselectable for Secure Boot").

 

How can I enable the UEFI/Legacy Boot option again in order to dual boot the computer? I want to be able to boot from USB or from the CD Drive.

 

 

 

Thank you very much for helping me out!

 

 

 

 

 

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