Asus memopad7 170C, unlocking bootloader fails

I'm trying too root my Asus memo pad 7 (170C), I've tried EVERY method, using KingoRoot, SuperOneClick, Frameroot, motochopper. None of them worked.

So I decided to do the rooting stuff myself, first I tried on Windows 8, the fastboot driver was not recognized, I installed the PdaNet, It recognizes the device now, the problem is when I run "fastboot oem unlock" or "fastboot oem unlock0x0b05" (ASUS VendorID), it returns : "FAILED (remote: unknown OEM command)"

I enter bootloader with "adb reboot bootloader" or by pressing Volume Up and Power.

I have also tried in Ubuntu 14.04, It doesn't even recognize the device in fastboot, and yes I run fastboot as root, still no chance :-( "fastboot devices" returns nothing, and "fastboot oem unlock" returns "Waiting for device"

I did run "usbls" command, and it was clear that the OS has recognized the tablet, but why the fastboot does not?

Here is some information of my specs: ASUS MemoPad 7 (170C) Windows 8.1 64bit AND/OR Ubuntu 14.04

Bootloader: DroidBoot Provision Os, DroidBoot Ver: WW_MeMO_Pad-11.2.3.28-20141230 IFWI Version: 64.25

PLEASE somebody save my life as I'm stuck with it for a very long time!