Fixed, https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-3039#post-1420134
Thank you very much! I had to order new CPU as well, so there's gonna be some anxious waiting before flashing... Edit: Done flashing, BIOS works without a hitch.
Anyone still have a link for the - Manufacturer: ASUS - Model: Z87-PRO Rev 1.0 - BIOS Type: AMI UEFI - BIOS version: 1504 - SLIC 2.1 file?