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Cannot enter BIOS

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Hi guys :) Some time ago I made some changes in the BIOS menu, don't remember what, but I am unable to enter now....

When I power on the PC and press F2 (my combo) it leads me to OS menu (there is also run system diagnostic option)...

The laptop supports UEFI, but I don't have such an option to restart in UEFI firmware settings...

I tried with cmd -> "shutdown /r /rw", I get message "The system could not find the environment option that was entered.(203)"...

Any advice ?
 
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