@Seeed_Kian, thanks for replying. I have followed the directions on that page, but get stuck at the point of “… the chip enters Bootloader mode and the burn port appears again.” I think the SAMD21 is in bootloader mode (the orange light is flickering) but the ‘burn port’ doesn’t appear. By “burn port,” I think it’s meant that a drive shows up in my Files window; this doesn’t happen for me.
Any other suggestions? Anyone with experience with this device on a Linux system have similar problems?
-Kevin