Here’s what you need to do to remove danuntu.
1. First, you will need to erase danuntu from the sdcard/USB
drive. To do this, simply create a new partition table with
gparted and a new partition with maximum size and the
filesystem you prefer (BTW, android recognizes only fat32).
2. This step isn’t actually necessary if you do not intend to use a
custom recovery (CWM).
2.1. Your device must be roooted. If you do not have root on
your device follow step 2.2. Download your custom recovery
image (or extract it from an installation zip) and this file. Copy
both of the files in /data/local/tmp, install and open the
Terminal emulator app, and type the following commands:
su #here grant superuser access if prompted
cd /data/local/tmp
chmod 777 *
./flash_image.bin recovery ./recovery.img
2.2. You device doesn’t have to be rooted. Simply flash your
recovery image using Rkflashkit on your PC. If the recovery is
inside a zip file, simply extract it: the recovery image should be
in the root directory of extracted zip folder.