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Here's How to Upgrade Windows Phone 8.1 to Windows 10 Mobile

Brian Burgess

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  • 4 months later...

Hi @srinivasan You may get more replies from other forum members latter. I don't think your Celkon 400 is eligible for the W10 update!

You can read about it in the link below! If you got the message "not available" there's a good chance your phone is not eligible for the upgrade!

Welcome to the forum!!;) Here's a good link to check by @Brian Burgess  https://www.microsoft.com/en-us/windows/windows-10-mobile-upgrade


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