H:\Tegra\ac100-4.0-tests\nvflash>nvflash.exe --bl fastboot.stock.bin --sync
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 2
   chip sku: 0x8
   chip uid: 0x17006187415f6197
   macrovision: disabled
   hdcp: enabled
   sbk burned: false
   dk burned: false
   boot device: emmc
   operating mode: 3
   device config strap: 1
   device config fuse: 0
   sdram config strap: 1

downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: fastboot.stock.bin
/ 524288/936016 bytes sentdata send failed NvError 0x30012
command failure: bootloader download failed

H:\Tegra\ac100-4.0-tests\nvflash>