tried the cold reboot with the sd card in
it will boot into the old os 4.0.3
then did this
If updates are not appearing as expected, try going to Settings - Applications - Manage - All - DMClient - Force Close/Clear Data/Clear Cache and then reboot.
after inserting the micro sd card
it showed a blue triangle at the right bottom showing found one update the same as i put on the sd card clicked ok..ok.. to install
then the green bot showed up and the blue bar which went to full ,did 2 reboots and then the same old asus logo with the circle spinning and then the blue message on the screen android is updating and optimizing app ......of 128
ps make sure your battery is atleast 50 % charged or put the power lead cause it took me 15 min updated to 4.2.1
then gave a message that it has found another update which is 254 mb i downloaded that as well directly onto the machine
but in the end it gave me an error message with the green bot down and a red exclamation mark on the tummy
had to reboot the machine
its running 4.2.1
Is this right how can go for this update and why it failed ,i think that i left the sd card in it with the old files on it
go to Settings - About - Check for update.