Maybe the update replaced the Baseband?
What baseband are you running?
I'm running 4.4.2 on my S3 with the XXEMB5 baseband which I have as a ZIP file if required.
Baseband XXUGMK6 , Odin does flash red and say fail, not sure why as I did a wipe. When loading 4,3 on in Odin there was no one TAR file so I had to put the bl,pda,phone,csc all in. Before I just did the pda. Getting signal now and phone seems to be working fine But odin said "all threads completed" succeed 1/ fail 1
UPDATE
All seems to be working except the google play store wont update to the latest version. so downloaded the apk for it online
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