Here is the OTA JRO03C Jelly Bean update (from JRN48D).

TAKJU – JRO03C – Maguro:

edfff6d328f1.signed-takju-JRO03C-from-JRN84D.edfff6d3.zip

Instructions:

If you are not on JRN48D, please follow/flash this first:
http://droidbasement.com/db-blog/?p=2659

then,

Boot CWM for maguro using fastboot (fastboot boot recovery.img):

recovery.img

then,

Using adb:

adb shell mount /data

adb push edfff6d328f1.signed-takju-JRO03C-from-JRN84D.edfff6d3.zip /data/media

Flash in recovery.

…..

Source:
http://forum.xda-developers.com/showthread.php?t=1419170

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