After the reboot I got a system update message, so I ran aLogcat and managed to grab the REL04 US link:
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[Google Link]/ota/sony_beetle/5cae61486b96.PKG_REL04_NSZGS7_U2_1210_5720_20120928_URSC.zip
EDIT: Looks like I can't update the wiki page as it says only admins can.