Why can't I get into fastboot mode?

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AC Question

cant get in to fastboot mode!!

i have downloaded the sdk stand-alone package and tried too unlock boot loader but my phone wont get to fastboot mode.
first i type the command: "adb reboot bootloader" , and then my phone turns off immediately but then nothing...... the screen stays black and even if i tried it manually it doesn't work, my phone keeps going on and off if i hold power+volume-up. if i try any other combination it goes in recovery mode.
ok and after i execute the adb command i put: "fastboot oem unlock" and then i get this "..." like forever. if i remove the phone it gives me an error!
.
here the command prompt log:


Microsoft Windows [Version 10.0.10240]
(c) 2015 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>fastboot oem unlock
< waiting for device >
^C
C:\WINDOWS\system32>fastboot oem unlock
< waiting for device >
^C

C:\WINDOWS\system32>adb reboot bootloader
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
error: device '(null)' not found

/*from here i plugged my phone in and usb debugging enabled*/

C:\WINDOWS\system32>adb reboot bootloader

/*it truns off and stays with a turned off screen*/

C:\WINDOWS\system32>adb reboot bootloader
error: device '(null)' not found

/*i check to see if phone is connected*/

C:\WINDOWS\system32>fastboot devices
mt6582_phone fastboot

/*this is where it gets stuck*/

C:\WINDOWS\system32>fastboot oem unlock
...

/*then i unplug my phone and get this*/

FAILED (status read failed (Too many links))
finished. total time: 103.600s

/*the rest is just me trying to figure it out */

C:\WINDOWS\system32>fastboot devices

C:\WINDOWS\system32>fastboot devices

C:\WINDOWS\system32>fastboot oem unlock
< waiting for device >
^C
C:\WINDOWS\system32>fastboot devices

C:\WINDOWS\system32>fastboot oem unlock
< waiting for device >
^C
C:\WINDOWS\system32>adb reboot bootloader
error: device '(null)' not found

C:\WINDOWS\system32>adb reboot bootloader
 
Re: cant get in to fastboot mode!!

It might be a signed driver issue. What device is this for?
 

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