Microsoft has released yet another new Windows 10 Mobile Insider Preview Build 10572 on the Fast Ring, which essentially comes with fixes and performance improvements.

Following the last week’s Windows 10 Mobile Insider Preview Build 10549, Microsoft has rolled out another preview version of Windows 10 Mobile for its Fast Ring insiders with Build 10572. Though before you decide to upgrade, you’ll need to downgrade to Windows Phone 8.1 as this is a single update, which doesn’t allow you to upgrade from earlier Windows 10 Mobile builds.

As, the new build is essentially a follow-up of last week’s build 10549, which apparently also required users to roll back to Windows Phone 8.1. As by doing so, the company wants Insiders to test the upgrade path that millions of Windows Phone 8.1 customers will take to upgrade to Windows 10 Mobile.

Apart from a few minor additions, the latest build is primarily focused on bug fixes and performance improvements. The new features include the ability to send texts and receive missed call notifications via PCs (running Insider Preview Build 10565 or higher). Users can also check out the built-in Universal Messaging apps with the new build. While several improvements have been made to Cortana, which now gets integrated with Uber ride-hailing service. Other additions include the ability to save offline maps to an SD card, and the Edge browser now gets the option to customize the default search engine.

Another noticeable change is that the OS is now simply called Windows 10 Mobile as opposed to “Windows 10 Mobile Insider Preview,” which rather suggests that the OS is almost ready for the RTM stage. Microsoft is expected to sign off the final version of Windows 10 Mobile next month. The newly announced flagships – the Lumia 950 and Lumia 950 XL will be the only handsets to come pre-loaded with the OS out-of-the-box, while existing Windows phones will be getting the update starting in December.

See Also: Microsoft starts developing Windows 10 Redstone after Threshold 2.

Here’s a list of known issues with build 10572 Microsoft has detailed in the blog post:

  • Visual Voicemail sync is broken on some devices. You may need to call your voicemail directly within the Phone app > Settings > Change more settings for Phone > Call Voicemail.
  • Opening message threads within the Messaging app will crash on dual SIM phones if the second line’s Messaging tile is removed from the Start screen (even if only a single SIM is used). The second line’s Messaging app will also appear to be removed from the All apps list. To work around this issue, the second line messaging tile must be linked to the first line messaging tile by opening up the first line in the Messaging app then go to Settings > link tiles.
  • On Dual SIM devices, unpinning the second line Phone tile from the Start screen will make the entry disappear from the All apps list. Rebooting the phone will cause the tile and application to both reappear.
  • Photos cannot be selected for sharing through third-party apps like Facebook, Facebook Messenger, Instagram Beta, WhatsApp, etc.
    Some devices will get into a state where the Phone app will continually crash upon launch. Resetting the device will recover it from this state.

See Also: Microsoft Surface Book with 1TB SSD, 16GB RAM, Core i7 up for pre-order for $3,199.

Meanwhile, the Windows maker also has one more build in the pipeline with number 10575 which is currently undergoing testing in the outermost ring of Microsoft’s internal testers. And it’ll support upgrading from both Build 10536 and 10549.

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