Well, Redstone build 14291 caused a few issues, not least that you couldn't hard reset and restore a backup. The bleeding edge, sure, but this must have caused so many issues that, even on a public holiday, Microsoft has pushed out another small, fix-up update to Windows 10 Redstone that lets backup/restores work again. There are other fixes too, listed mainly to do with languages and keyboards. Build 14295 is available for any Windows 10 Mobile Insiders, including those using any of the Windows 10-compatible hardware models.

From the Microsoft announcement post:

Today we are releasing Windows 10 Insider Preview Build 14295 for both PC and Mobile to Windows Insiders in the Fast ring.

In addition to devices that shipped with Windows 10 such as the Lumia 550, 650, 950, 950 XL, Xiaomi Mi4, and Alcatel OneTouch Fierce XL, we are releasing this build to the list of devices that will be capable of receiving updates as part of the Windows Insider Program except the Lumia 635. We will add the Lumia 635 at a later date. Going forward – these devices will be able to receive new builds from our Development Branch that we release to the Fast and Slow rings. As we stated previously, only devices which are eligible to receive the Windows 10 Mobile upgrade will be able to get preview builds from the Development Branch.

With this build being only a few days newer than the last build, you won’t see any major new features. However, we do have a good set of fixes in this build that Insiders will enjoy.

• We fixed the issue where if you reset your phone on Build 14291 and restore your phone from a backup, restore will fail to install apps from your backup’s apps list leaving blank grey titles on Start. You should be able to reset your phone on this build, do a restore from a backup, and have your apps installed and restored appropriately.
• We fixed an issue where new languages and keyboards were not downloading. However, there is an issue where the “reboot” UX doesn’t appear in the Settings app after downloading a new language or keyboard. You will need to go to Update & security > Phone update and restart your phone manually from there for the new language and keyboard to go into effect.

There are, as usual, some known issues too:

• After updating to the most recent builds from our Development Branch, a system API failure occurs after the update that causes the Microsoft Band 1 or 2 to have sync issues. To get out of this bad state, you can reset your phone on this build, re-pair your Microsoft Band, and syncing should work again.
• After upgrading to this build from a previous build from our Development Branch, attempting to connect to a Miracast receiver the connection will fail. There is no workaround for this issue unfortunately on Mobile.
• The Gadgets app will not detect the Microsoft Display Dock on phones running Windows 10 Mobile Insider Preview builds, and thus cannot update the firmware version. If you have a dock which has already been updated to version 4 then this will not affect you. If you have a dock that has not been updated, then you may experience some minor issues with USB-C stability. You will still be able to use your dock and Continuum.

Good to see Microsoft jump on this issue so quickly - though there's plenty more than needs to be done to get Windows 10 Redstone fully mature and bug-free (on both PC and mobile) over the next few months.

Our editorial devices on Redstone are all updating happily, I'll update this story if I have more to add later.