Bios Mods -The Best BIOS Update and Modification Source

Hello,i tried this tutorial on youtube https://www.youtube.com/watch?v=dR4xA3EXPDA  and everything went smoothly
but my tested gigabyte r9 280x still doesnt boot.

I used this "Intel ME System Tools v8 r3" https://multiup.org/e325e0572d26f60466fa94563b0569b0
this "amibcp-4.53" https://multiup.org/325b9ace8fb0a4dc213fe2505a96f061
and this is the already edited bios backup file https://multiup.org/8471bc0c4792921910921988c7e54b8b

Please help.

after the bios edit i tested a gtx 960 on that board and its working fine https://prnt.sc/_b48ALT27yKv. also i tested the r9 280x on another board and its working fine like on the screenshots https://prnt.sc/0I7yDD4TJNvu. i dont understand what the problem is. please help.