m15 R1, why did Dell disable undervolting? - Dell Community
BIOS Update blocked due to unsupported downgrade - Dell Community
Lost undervolt with bios update, then reverted. Undervolt didnt revert. Throttlestop appears to work but voltage stays stock... Any help? (XPS 9550) : r/Dell
BIOS update blocked due to unsupported downgrade, #2 - Dell Community
Solved: Unable to update BIOS of Precision 3510 - Dell Community
New Dell BIOS updates cause laptops and desktops not to boot
I can Downgrade Dell BIOS to older version by making new Dell BIOS update file : r/Dell
Downgrade bios to 2.2.0 (xps 13 9310) - Dell Community