EB13 Tool:
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EB13 -> EC05 update.zip
http://android.clients.google.com/pa...EB13ToEC05.zip
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Odin does not exactly wipe everything unless set to(it has a bunch of options)..like the pit file is necessary if you plan to redo the partitions and etc..
Before rooting..how much space is in your system partition? and after rooting..do you see any apps disappear? like asphalt demo and etc?