GDR 3 os version

raxy21

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Sep 30, 2013
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Hi, i have a Lumia 720 with me with gdr3 with Lumia black update, what is your os version for it, my phone is showing- 8.0.10517.150.
once i checked any updates for my phone it is showing new update available with Microsoft update 8.0.10521.155 with this version, is it any security update or anything anyone can confirm your os version?
I'm i running older version help me?
 

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