I previously started a thread titled “How to Add NVMe M.2 SSD Support to Old Award-Phoenix BIOS Files?”. You can find it by searching the forum and do it yourself.
However, if the BIOS update is successful, I would like you to get back to us here and share your BIOS screenshots and M.2 SSD speed values. If you can do this, you will be guiding other users as well.