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New firmware update for Lumia 950/950 XL: 01078.00038.16025.390xx

Hey all,

we have started rolling out a new firmware update for Lumia 950 and Lumia 950 XL: 01078.00038.16025.390xx. Key improvements in this release include:


  • Stability fixes.
  • Improvements for GPS reliability.
  • Improvements for call audio quality.

The availability of this update may depend on your phone model, region or network service provider. At the time of writing this post, the update is available mainly for selected open market variants, but the rollouts should continue gradually during the coming days and weeks.  

Windows 10 is updating continuously, so make sure you follow all the update notifications that appear on your phone. To check for updates, you can also tap Settings > Update & security > Phone update > Check for updates. For detailed update instructions, see.

If you are a Windows Insider user, see. Note: this does not affect general firmware availability.

To read more about the new features included in Windows 10 Mobile, see What's New in Windows 10 Mobile.

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Any improvements of BT stability? Phone disconnecting during  calls in my car makes me angry.

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Thanks for keeping us in the loop, keep them updates coming! :)

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Same question: how about the BT stability?

Here you can find a bunch of really desperate 950(XL)(DS) users who are all waiting already for months to fix this finally:

http://answers.microsoft.com/de-de/mobiledevices/forum/mdlumia-mdsettings/lumia-950-bluetooth-abbruch-keine-bluetooth/66e191b9-d14b-4d58-81e3-3ad3fce52b95?page=1

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Thanks for the update.

Would it be so hard to include a preliminary schedule with product codes, so we could have an idea when our specific phone might be targeted?

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Any improvements of BT stability? Phone disconnecting during  calls in my car makes me angry.

FWIW, W10M Build ".71" has seriously stabilized my BT car connection. Hopefully it will for you too.

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Thanks for the update.

Would it be so hard to include a preliminary schedule with product codes, so we could have an idea when our specific phone might be targeted?

Seconded! Would be great to see which combinations are released and which ones are live vs staging.

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Not mine. Same terrible situations all two months I have 950XLDS. Even on last build.

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Bummer. Well, let's hope this firmware will help you then. :)

FWIW, I did a hard reset (Settings > System > About > Reset Device) after updating to .63 a few weeks ago and getting the firmware. Maybe that helped me out along the way. I was having severe battery drain prior to that, and it went away too.

Good luck!

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Aaaaaaand the poor sound quality of the back loudspeaker is still not fixed. The 5sec noise and click after a notification is played seems to be gone. But after pressing a keyboard key with keyboard sound on the 5sec noise and click does still appear after the keyboard tone is played.

There is still a noticeable "background" noise while a notification or what ever is played. The sound quality of the back loudspeaker is not crystal-clear. I really hope you get this fixed somehow.

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I would advise those users to check the firmware update (when available for their phone) and report the result. The post is in German, so I just vaguely read it through. We are listening to the feedback and AFAIK BT connectivity problems are being investigated with priority. That being said, there are unfortunately no significant fixes for that area included in this particular update (otherwise it would have been listed in the "key improvements") . However I believe there should be some improvements for scenarios where the BT connection turns itself off during phone call. If the folks are still experiencing that type of issue, let us know!

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Last updated April 22, 2025 Views 11,465 Applies to: