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July 6th, 2025 13:25
Change boot mode to UEFI boot mode secure boot on Dell 5820
Change boot mode to UEFI boot mode secure boot on Dell by mistake but won't boot anymore the screen is black I'm not able to have access any more to bios I removed the battery the jumper but nothing.
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anne_droid
3 Apprentice
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1K Posts
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July 8th, 2025 16:08
Hi
Unplug the storage device.
Power on, and it may very well give an error message and make the BIOS available.
Reset to Legacy/Default or whatever.
If in doubt please ask.
DudeB
1 Rookie
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3 Posts
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July 14th, 2025 07:56
It doesn't work. I tried with my Precision T1700. No boot screen nothing.
Done these too
-CMOS removal,
- RAM removed
- Boot USB flash
- Jumper change
- Blind key test.
can you guide any other method apart from BIOS reflash through chip.
anne_droid
3 Apprentice
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1K Posts
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July 14th, 2025 10:33
Hi
No not really, is it a 5820 Precision Tower?
I would make 2 USB's, one for Legacy Boot and the other for Secure Boot, and have the same BIOS Recovery executable on each. Both plugged in before PWR on.
But I guess you have already tried/dismissed that approach.