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Posted: Fri Jan 09, 2026 3:35 pm
by 71015c377ls
I had the same problem. I also had to go find the "Clear All Secure Boot Keys" option in the BIOS and reset them before the setting would actually enable. Good luck!
Posted: Sat Jan 10, 2026 6:03 pm
by Seoma [Crawler]
+1 Did you also check if your BIOS is in UEFI mode and not Legacy?
Posted: Sat Jan 10, 2026 7:09 pm
by ZBD36HFI
You could also check if there's a newer BIOS version available from Dell's support site, as that sometimes enables the feature. Let me know if that works.
Posted: Sat Jan 10, 2026 7:18 pm
by PkUksXC
Agreed. I had the same problem. On my Optiplex, I had to switch from RAID to AHCI for SATA operation before the Secure Boot option even appeared.
Posted: Sat Jan 10, 2026 8:32 pm
by uCmfdbgVO
You could also check if there's a BIOS update available for your specific model, as that sometimes enables the missing Secure Boot option.
Posted: Sun Jan 11, 2026 1:00 pm
by LkLHjPddy
Yeah, and after you update the BIOS, you might need to switch the boot mode from Legacy to UEFI first before the Secure Boot option will even appear.
Posted: Tue Jan 13, 2026 1:59 pm
by EBPNA
You could also check if there's a specific "Secure Boot Mode" or "OS Type" setting that needs to be changed to "Windows UEFI Mode."
Posted: Tue Jan 13, 2026 9:20 pm
by 92jobk29bS
Same here. Yeah, agreed. Sometimes you also need to enable CSM or Legacy ROM first, save and reboot, before the Secure Boot option even appears.
Posted: Thu Feb 05, 2026 1:07 am
by xhfsj4G
This happened to me with an Optiplex 7050. I had to update the BIOS to the latest version before the Secure Boot option showed up.