we have started rolling out a new firmware update for Lumia 550/650: 01078.00037.16082.410xx. Key improvements in this release include:
•Stability and quality improvements.
The availability of this update may depend on your phone model, region or network service provider. At the moment, the update should be already available for first batch of phones and the rollouts will continue gradually.
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.