fast boot oem unlock does nothing. No output

I tried unlocking the bootloader of my Yuphoria with the following command

fastboot -i 0x2a96 oem unlock

But this is the output that I'm getting.

...

OKAY [ 0.001s] finished. total time: 0.001s

It does not show any kind of warning that the data on the phone will be erased. ADB and fastboot is detecting the device. Here is the output for fastboot -i 0x2A96 oem device-info

...
(bootloader) Device tampered: true

(bootloader) Device unlocked:true

(bootloader) Charger screen enabled: true

(bootloader) Display panel:
OKAY [ 0.005s] finished. total time: 0.005s

I tried flashing the recovery.img after that but it does not work. What am I doing wrong? I work on Linux (Ubuntu 15.04)

Edit:
Here is the link to the CM page where I got the instruction from. I followed all the steps mentioned on the page.