bios-downgrade

I have a Dell XPS 7590, which has well-known fan-noise problem and which I resolved by going to Dell Power Manager, choosing the Thermal Management tab, and selecting the Quiet option. I updated the bios to 1.9.1 last night in response to an update notice from Dell labeling it "urgent". But...

greetings all, i think i need you ALL to help me out on this. my laptop is Toshiba Qosmio x770-107 that have now bios v2.1 which makes me throttle & overheat. i need a way to flash downgrade my bios to 1.10 i have the file & the afudos but it keeps saying '' write protected '' & i dont have...