How to fix error: Legacy option ROMs cannot be enabled with PTT enabled on Dell PC.
- Disable PTT on checkbox 
 Go to Security -> PTT Security. Then disable PTT on checkbox.
- Apply Apply new settings, and re-enable Enable Legacy Option ROMs checkbox 
How to fix error: Legacy option ROMs cannot be enabled with PTT enabled on Dell PC.
Go to Security -> PTT Security. Then disable PTT on checkbox. 
Apply new settings, and re-enable Enable Legacy Option ROMs checkbox