Away from the bleeding edge testing of the Redstone branch of Windows 10 Mobile, there's still the 'Release Preview' ring on the Insiders programme, now the (very safe) testing ground for final bug fixes and enhancements destined for all the production W10M phones (now including all the upgraded Windows Phone 8.1 devices). So, roughly a week ahead of final deployment, we have a new build, 10586.242, now available for such (safe) Insiders - but also, significantly, to all the people with older Windows Phone 8.1 devices who upgraded to Windows 10 Mobile anyway (through the programme), against Microsoft's advice.

Described as a 'Cumulative Update', there's an official changelog, quoted as:

• Improvements to general application compatibility.
• Improvements in the upgrade experience, including fixing an issue where some devices would lose data connections or touch input after upgrading to Windows 10.
• Improved the reliability of reminders.
• Improved UI for tracking data usage under Settings>Network and wireless>Data usage.
• Improved the navigation bar experience for some devices.
• Fixed an issue where some SD card readers were not recognized.
• Updated Daylight Savings in countries with Daylight Savings changes.

So this is what's currently available to all those with non-approved W10M devices, e.g. the Lumia 1020, 920, 925, and so on. Comments welcome on how this latest build performs on the older hardware.

For production 950, 650, and even officially upgraded devices, this will be just another stability update, of course, arriving for non-Insiders in a week or so's time if all goes well.