Google's new Android One , That is launched by Micromax , Spice and Karbonn comes with Android 4.4.4 Kitkat out of the box and is the best Smartphone in this range . Android one comes with 4.5 inch HD display , Moreover it comes with Dual Sim capablities and Removable MicroSD card .
Also see - How to root your Android one Smartphone
First You have to Unlock the Bootloader of Android one Smartphone : Micromax Canvas A1, Spice Dream Uno, Karbonn Sparkle V -
Step 1. Reboot your device to Fastboot mode .
Step 2. Execute the following command -
fastboot oem unlock
fastboot format userdata
Note : - You will loose your all data ! So kindly keep a backup !
Installing CWM Recovery from Fastboot mode -
Step 1. Download the CWM recovery image from - Here
Step 2. Reboot your phone into fastboot / bootloader mode
Step 3. Flash the image you downloaded from above !