Hi all,
I have the same issue as @Sierra and @Mercennarius had. I have done everything as stated in the guides by fernando and others.
I did this with my the vendor (15B7) and device id (5011) and got “Option ROM configured successfully.”
After that, I followed this guide: [Guide] AMI (non-UEFI) BIOS Modding - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com), how to insert the edited Option ROM correctly for an non-uefi based ami bios with mmtool.
Afterwards, the bios was flashed successfully into my motherboard with a followed cmos reset (as some stated). In the bios options I can now choose the nvme drive, but its not booting of it… .
@Dagal did modify the bios for both of them and then it worked for Sierra and Mercennaries. Can someone help me out, what I am doing wrong? I have an Asus Rampage Extreme III Motherboard.