I too have a bricked early 2015 MacBook Pro, 13". What is odd is, I used it all along since June as part of the Developer Beta Program without issue. Several times I booted off a USB drive and reformatted the entire drive and installed Big Sur just fine. When the final release came out, I again reformatted using the external drive and installed Big Sur no problem whatsoever. Then, a week later I began to see odd kernel panics. I decided to reformat and try again hoping it wasn't hardware and now all attempts to install fail. I've tried reformatting (can see my internal SSD) then installing. No. I've tried using internet recovery, reformatting and installing, nope. I downloaded the Catalina full installer, made a second USB drive and reformatted, then tried to go back to Catalina, nope. It says install error. So, my Macbook Pro 13, which was near perfect condition, is DOA. If Apple would accept it as a trade in for a new Macbook Air M1, I'd jump and we can leave the lawyers out of this. : )