I have a Lumia 640 XL running wp10 and I still have denim on my phone. I have had it on my Lumia 520 about two years ago and I know that denim hasn't even reached all regions yet. No point on the bells and whistles of wp10 and still on old firmware. I think it's time for a new firmware. I have read somewhere a year ago about Emerald being the next firmware but the trail went cold.
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