Flashing Tx2 with Jetpack 3.3.2 hangs

Autonomous Machines Jetson & Embedded Systems Jetson TX2
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These are the exact steps I followed and a complete log of the flashing process:

  1. Download and unpack the L4T 28.3 TX2 BSP archive from https://developer.nvidia.com/embedded/dlc/l4t-jetson-driver-package-28-3-tx2
  2. Connect micro USB cable to Orbitty and PC. Put board in recovery mode. Ensure the board entered recovery mode with lsusb.
  3. Unpack the Nvidia BSP archive to create a Linux_for_Tegra folder. Enter it and issue: sudo ./flash.sh jetson-tx2 mmcblk0p1

This inevitably completes with:

tegradevflash_v2 --iscpubl
Cannot Open USB

cti-orbitty-tx2-L4T28.3-Ubuntu16.04.log (22.9 KB) (This one ends with just C not Cannot Open USB. It seems to be the same error though.)