[Q] Unlock AT&T Samsung Galaxy S4 (with Latest firmware) - Galaxy S 4 Q&A, Help & Troubleshooting

Is there a method to unlock the galaxy s4 with the latest firmware? Is there a method to downgrade it and then unlock it?
Also, I want to use it on Verizon, does the modem on the AT&T version support CDMA/LTE etc. on there?
Thanks!

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Sent from my twi5ted SM-G900A using Tapatalk

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