Originally Posted by bc_1
I have NAE modem and when i try to return to MK2 MJ9 it fails via odin
To get back to MF9 make sure you turn the phone off completely - not use a 'boot to download' option/app.
Run Odin as administrator of course. and uncheck the 'Auto Reboot and 'F.Reset Time' options
Boot to download mode and try again.
Then power off phone completely (hard restart) and see if it sticks. I know sometimes people actually have to do it a few times to get it to stick.