Pro tip: many that ship with an SD inside will have the factory firmware and device-specific keys still recoverable on the card (secure erase is too slow for production I guess) so before turning the device on for the first time, remove the card and image it for maximum chance of recovering the FW intact.
Pro tip: many that ship with an SD inside will have the factory firmware and device-specific keys still recoverable on the card (secure erase is too slow for production I guess) so before turning the device on for the first time, remove the card and image it for maximum chance of recovering the FW intact.