Well that opens another pair of shoes, if you said that earlier it would be helpfull more.
https://www.techpowerup.com/vgabios/?architecture=&manufacturer=Gigabyte&model=GTX+1070+Ti&interface=&memType=&memSize=&since=
You're gonna need to request bios from someone.
Ask them there, explain why, and they will help you.
https://www.techpowerup.com/forums/
Just to make sure, every GPU has sticker on it saying which model is it, just look it up to be 100% sure about it, there is no turning back after flashing, rarely you corrupt your bios.