cannot unlock boot loader (Lenovo a6600 plus)

I tried to see bootoader lock status using adb command
"fastboot get bootinfo"
result is
"C:\Users\Guru\Downloads\New>fastboot get bootinfo
.... "
No response

Then I used this command
"fastboot oem unlock"
It promted for the confirm (yes [Volume Up] or No [Volume Down]).I pressed volume up key.But Nothing happened. Then I pressed volume down button. it said "unlock failed..... return to fastboot in 3s"

after 3 seconds :

Select Boot Mode :
[VOLUME_UP to select. VOLUME DOWN is OK]

[Recovery Mode]
[Fastboot Mode] <<==
[Normal Mode]
=> FASTBOOT mode.....

I tried to select the mode.But No key was worked.

Please help me
Sorry for the poor english.

One click root apps not working example ..king root pc and etc pls help me

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