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I have a Nokia 625 handset with 3G. Where and How can I firmware update it from 3G to 4G?

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    As far as I know, the 625 is already 4G-capable. Further, I don't think any Lumia phones can be upgraded in such a manner. What makes you think the Lumia 625 needs to be upgraded, and that such an upgrade exists? – Indrek Dec 2 '16 at 10:48

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