I am describing my problem from beginning..........
I had nitroid installed
but when i tried to install kp49 the below problem arised and i posted it in kp49 thread

[I have got a problem installing kp49.......
I am currently having kp48 and kp48 boot image but when updating to kp49 it says can't update conflcting with application package kp48 boot image

and when i try to update kp49 bootimage it says can't update as kp49 breaks third party software policy.......

plz help]

apt-get update also failed to solve the above prblem as it said that pub key 400.....{sorry i don't remember the exact numer}.

So to get kp49 I unstalled kp48 bootimage and updated to kp49 successfully but again when i tried to install kp49 bootimage it said breaking 3rd party software policy so i unstalled nitroid also using unstaller and deleted every nitroid files using filebox.

"but know when I'm installing nitroid using autoinstaller it stalls everything fine as before but when it comes to end of installing N12 umay.tar and extracting packages it again says some pubkey is missing and after this it installs nitroid kernel and gives the successfully installed nitroid message and says to reboot.

when i reboot and select nitroit from multiboot
it gets started but while loading nitroid it says
"ROOT FILE MMCBLKOP2 NOT FOUND,
GURU MEDITION 000.... 633...."

I have tried installing nitroid 4 times after updating to kp49 but everytime same error msg is coming.
I am not using memory card and installing nitroid in emmc

plz anyone provide me solution for this problem