how to enter bios after adding a bad boot option?

[Waylli]

hi, i have added a bad boot option by mistake as my primary boot option(multiple OS on same machine) with fast boot enabled. Now i am only getting a black screen and can not enter bios or choose a boot option(F2/del). i have tried drainig power by removing batery and disconectiong from power for 24 hours , but no effect.... any ideas what i can try? i need to enter bios or flash but can not get past black screen....
Thanks

 

[maxwellmelon]

did you remove power and remove the coin battery from the motherboard for 10 min? what motherboard do you have?

 

[CelePlayzVLOGS]

BIOS is entered from F2&Start Button, first press F2, then press start button, press both for some time, then release the F2 button, BIOS on your screen, Voilá!