I got two new R4's and installed 2.1.1. I uploaded a few matrix sketches to board 1 and then it started failing to upload and spit out the dreaded
"No device found on COM7
Failed uploading: uploading error: exit status 1"
I figured I bricked it so I started using board 2 and it works fine. Either board will give Board Info but the first one refuses to accept a sketch. That was on my M2 MBP so I installed 2.1.1 on my Win10 zBook and I get the same thing. I don't remember what state the Mac left the board, but the Win10 leaves it with the Breathing Amber. I'm thinking about seeing if mains power will fix it. 