Just got a batch of these new boards, (around 50) and I see the 101 was removed and replaced with the 32U4. Wonderful Improvement!!! Anyway, I was playing with a fresh os install (Ubuntu 18.04.3) with all the latest patches, Fresh Install of Arduino 1.8.10. I added the local user to the dialout group and tried to upload the Blink sketch. I got an error half way through the process and now the 32U4 will not connect via the virtual serial port. The TX light just comes on solid. Pressing the Master Reset will cause the LED to pulse for a while and then back to the TX light stuck on and no virtual serial port. Did I kill the boot loader?