Lordvincent 90
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I haven't seen anyone successfully post the unrooted system image yet. I just picked up this phone today so I figured I'd pull the unrooted image.
Turns out the correct command was
I couldn't get /mnt/externalsdcard/ to work. Df in terminal said it was /dev/block/mmcblk1p1 which didn't work either. But ls showed the directory '/external_sd' and what do ya know! Success! 
https://docs.google.com/file/d/0B71-cQS6H-yYVmVSSlpLcHk5SDQ/edit?usp=drive_web
Turns out the correct command was
Code:
did if=dev/block/mmcblk0p17 of=/external_sd/system.ext4.tar

https://docs.google.com/file/d/0B71-cQS6H-yYVmVSSlpLcHk5SDQ/edit?usp=drive_web