Asus memopad7 170C, unlocking bootloader fails
Ok, I searched for it a lot, tried everything and here is the final solution:

The propper rooting tool for ASUS tablets that use a x86 processor is "RootZenFone", the old fashioned way "fastboot oem unlock" and replacing the the recovery with something else DOES NOT WORK (As the time being).

If you have bricked your tablet (as I did!) you can perform a full recovery by following the instructions in this page. (Remember to install the USB drivers, provided in the same page)

If you are encountering the "Unfortunately Asus Demo has stopped" over and over again (even after a full ROM recovery), you need to run the RootZenFone (I tried version RootZenFone-1.4.6r.apk and it worked) after a fresh ROM recovery (using the link I provided above).

And it's really important to remember to "Forget each WiFi network" And "Disable the WiFi".
If you are getting "Unfortunately Asus Demo has stopped" error, you NEED to disconnect the USB cable before you proceed to root the device using RootZenFone.

Just follow the instructions and you are good to go :)