AMD Radeon RX 580 Updated preparing for BigSur - Opencore update.

It's been a long time since I immersed myself in this world. I needed to upgrade from high sierra, but then pandemic times came, there was no GPU available and I had to stick to the issues with the old software, but NOW, finally! I already changed my GPU to a Radeon RX 580 and I'm preparing for the os update (I'm scared! hahaha).

First, I need to change my system definition (Clover), from iMac 14.2 to iMac 15.1

I have some guides here to follow, but I need to know how I can backup my boot...

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