I'm a new Spresense user. I'm trying to get my board working for the first time. I'm on Ubuntu Linux 18.04.
I installed the SDK and tried to use the flash.sh script. It just hung.
I also tried to use the Arduino IDE, installed the Spresense board, but burning the bootloader also hangs with no output.
Now when I do lsusb, I do not see the /dev/ttyUSB0 device.
Does anyone know how to proceed? How do I burn the initial bootloader so I can upload programs to the board?
Seattle WA USA