[Q] flash failed topic

hello guys when i try to flash the bt my wifi n7 2012 with 4.4.2 (grouper-Nakasi) is in error and do not understand why ... can someone help me?

Code:

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Microsoft Windows [Versione 6.1.7601]Copyright (c) 2009 Microsoft Corporation. Tutti i diritti riservati.


C:\Users\Francesco>cd C:\Users\Francesco\Desktop\Nuova cartella\nakasi-kot49h


C:\Users\Francesco\Desktop\Nuova cartella\nakasi-kot49h>fastboot flash bootloader bootloader-grouper-4.23.img
sending 'bootloader' (3911 KB)...
OKAY [  0.522s]
writing 'bootloader'...
FAILED (remote: (InvalidState))
finished. total time: 0.758s

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Code:

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fastboot mode
product name - grouper
variant - grouper
hw versione - er3
bootloader version - 4.23
baseband version - n/a
serial number - xxxxxxxxxxx
singning - not defined yet
lock state - unlocked

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forgive my english, but I translated with tranlate