help with custom bios xfx black edition

[dellzxd]

hi, i bought a xfx rx470 black edition, part number rx-470 p4ldb6. theres some custom bios for this card ? also, according to gpu-z this is my card  https://www.techpowerup.com/gpudb/b3772/xfx-rs-rx-470-black-edition.
hope someone can help me, also i get a message from polaris editor when open my bios, something like "bios is less than 512kb shoud corrupt your card" i should care ?