`fastboot oem unlock` does nothing. No output

I tried unlocking the bootloader of my YU Yuphoria on Linux (Ubuntu 15.04). Here is the link to the CM page from where I got the instructions from. I followed all the steps mentioned on the page. When I use the following command fastboot -i 0x2a96 oem unlock However, 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 are 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?