problem Variable not supported topic

hello I try Returning to Stock rom
Followed the following explanation:
http://forum.xda-developers.com/moto...ation-t2603358

this error !!!
C:\folder>fastboot flash partition gpt.bin
(bootloader) Variable not supported!
target reported max download size of 805306368 bytes
sending 'partition' (32 KB)...
OKAY [ 0.268s]
writing 'partition'...
(bootloader) This may take a few seconds, if a
(bootloader) different partition table is being
(bootloader) flashed since we need to backup
(bootloader) and restore a few partitions
OKAY [ 0.449s]
finished. total time: 0.726s
C:\folder>