[Q&A] [Lenovo K910] Bootloader Unlock [KK 4.4.x] - Lenovo Vibe Z Questions & Answers

Q&A for [Lenovo K910] Bootloader Unlock [KK 4.4.x]
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Problem
I have used this method (stack.bat) for my Lenovo K910 and it didn't work. It took so long and all I got to was the first part where the bootloader is in false for everything (device tampered: false; device unlocked: false). I waited over 2 hours for any change in the cmd window, but no results. Then I tried to reboot my phone by pressing the power button since it was stuck on Lenovo logo, and then a line of text came up in the cmd saying "FAILED, unknows status code". So I tried again, same thing happened. It was stuck on the Lenovo logo. So I tried to reboot again and in cmd window similar error came up "FAILED, too many lines" or something like that. after the FAILED messages the cmd window is stuc on "waiting for device". So the only way to get rid of it is to close the cmd. I have 4.4.2 on my Lenovo. Is it supposed to take that long or even longer? What am I doing wrong? I't not the first time I have rooted my phone but I never had so much trouble to have to go through all of this hell. Please help

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When i am doing it stays at lenovo screen
at console it says that :
-----------------------╕╨╨╗stack┤≤╔±------------------------
---------------------┤τ╩ϊ╜έ╦°╬─╝■╡╜╩╓╗·----------------------
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
cannot stat 'data/unlock/emmc_appsboot.mbn': No such file or directory
cannot stat 'data/unlock/rpm.mbn': No such file or directory
cannot stat 'data/unlock/sbl1.mbn': No such file or directory
cannot stat 'data/unlock/sdi.mbn': No such file or directory
cannot stat 'data/unlock/tz.mbn': No such file or directory
--------------------------╒²╘┌╜έ╦°---------------------------
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
/system/bin/sh: can't create /dev/null 2: No such file or directory
/system/bin/sh: su: not found
----------------------╢┴╚κ4.4BL╫ώ╝■--------------------------
/system/bin/sh: su: not found
--------------------╓╪╞Ϊ╡╜fastboot─μ╩╜-----------------------
---------------------╝Ή▓ώ╜έ╦°╩╟╖±│╔╣ο------------------------
< waiting for device >
...
(bootloader) Device tampered: false
(bootloader) Device unlocked: false
(bootloader) Charger screen enabled: false
OKAY [ 0.011s]
finished. total time: 0.012s
...

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same issue
I have same issue today .
And I was able to restart back
And issue was that I don't have root permissions
look here on first step http://forum.xda-developers.com/android/development/lenovo-k910-tools-one-t2887839

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do i need to unlock bootloader and install twrp recovery
hello gays i need a help
do i need to unlock bootloader a n install twrp recovery every time i install new vesion of rom...
i use baralajbi rom ver 10 but i wont to update rom in version 13.phone is lenovo k910 dual sim
do I need to do whole procedure,although I had done in the first installation rom ver.10 (i mean on Unlock bootloader and install TWRP Recovery ) or i can simply use TWRP for rom install and i dont need to unlock bootloader and install TWRP Recovery because i already done it in first installation of rom v10.

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OMC|Viper said:
I have same issue today .
And I was able to restart back
And issue was that I don't have root permissions
look here on first step http://forum.xda-developers.com/android/development/lenovo-k910-tools-one-t2887839
Click to expand...
Click to collapse
Hi. I've dont root access with that method but still i dont have root the root genius show screen "you are rooted" but with silmple check by typing su in terminal emulator shows me that i dont have root and still i cant unlock bootloader having same problem as guys here. pls help. ( sorry for my english)