I know nothing about the i20 since we don’t get it here, but looks like on Hyundais you’ll most likely have to pull the entire factory radio and replace it with an aftermarket one. I believe on my friends Veloster it was a distinct module, but that one was 2g only and since 2g is dead it’s not really doing much.

Maybe if you’re lucky and it’s like my Subaru you can pull the radio, find that BlueLink is it’s own distinct module and just remove it. You’ll most likely have the same issue as me where your speakers and mic won’t work unless you build a custom adapter. I didn’t build my own adapter I found a guy online who does radio harnesses for aftermarket radios and he made a basic adapter for like $20, and a fancy one that lets my mic work for like $100.