Need help with bricked Huawei Honor 6

Hallo,

I need help with a bricked Huawei Honor 6.
I have almost no knowledge about unbricking and the like.
I tried to update my Smartphone Firmware and used Huawei Update Extractor
combined with cmd Commands.
My Smartphone is in an eternal bootloop and I can only access Fastboot&Rescue Mode.
I ve tried to install another firmware, but there is this command lines in CMD:

C:\Users\Kevin und Christina\Documents\Huawei Fastboot Flasher GSM HELP\adb>fastboot flash cust cust.img
target reported max download size of 471859200 bytes
sending sparse 'cust' (459730 KB)...
OKAY [ 48.349s]
writing 'cust'...
OKAY [ 16.092s]
sending sparse 'cust' (16208 KB)...
OKAY [ 1.711s]
writing 'cust'...
OKAY [ 0.532s]
finished. total time: 66.689s
C:\Users\Kevin und Christina\Documents\Huawei Fastboot Flasher GSM HELP\adb>fastboot flash recovery recovery.img
target reported max download size of 471859200 bytes
sending 'recovery' (13780 KB)...
OKAY [ 1.416s]
writing 'recovery'...
OKAY [ 0.439s]
finished. total time: 1.857s
C:\Users\Kevin und Christina\Documents\Huawei Fastboot Flasher GSM HELP\adb>fastboot flash boot boot.img
target reported max download size of 471859200 bytes
sending 'boot' (10596 KB)...
OKAY [ 1.091s]
writing 'boot'...
FAILED (remote: flash write failure)
finished. total time: 1.102s
C:\Users\Kevin und Christina\Documents\Huawei Fastboot Flasher GSM HELP\adb>fastboot flash system system.img
target reported max download size of 471859200 bytes
sending sparse 'system' (431287 KB)...
OKAY [ 45.667s]
writing 'system'...
OKAY [ 16.017s]
sending sparse 'system' (446975 KB)...

Can some one of u see what's wrong and how to solve this problem? There is one FAILED line and maybe that's the Problem.
In my fastboot mode there I can read in red letters: PHONE Unlocked.

Pls help me.