According to Windows Insider Chief Gabe Aul, Windows 10 Mobile Build 10575 is almost ready and is expected to debut early this week. The biggest change in the upcoming build would be that anyone can get it via a phone update on the Fast ring, which is quite contrary to the Insider Preview Build 10572 released last week.

The preview build rolled out last week required Insiders to go through a rather arduous task of downgrading their devices to Windows Phone 8.1 before they could install it. The issue was caused by a bug that prevented earlier builds from detecting a new version in the phone update. Hence, it required Insiders starting from scratch. Though the company did mention at the time of build 10572 release, that Insiders who’d rather not prefer re-flashing their devices can wait until next week when a new build that takes care of the above issue rolls out i.e. Windows 10 Mobile Build 10575.

Windows Insider Chief confirmed last week that a new build is due sometime early this week, provided if no major bug is discovered. While as far as features are concerned, we cannot really expect anything new as the upcoming build primarily fixes the lengthy upgrade process we saw with Build 10572.

Meanwhile, Microsoft earlier confirmed that the final version of Windows 10 Mobile is expected to begin sometime early in December. Implying that the OS is almost feature complete and the company is primarily focusing on bug fixes and fine tuning certain aspects. Since the rollout will happen in phases, hence not all existing Lumia devices will be getting the Windows 10 Mobile update in December.

Users will need to have the Lumia Denim update (version 8.10.14219.341, or higher) to be eligible for the Windows 10 Mobile upgrade. In addition, they will require at least 8GB of internal memory to comply minimum system requirement to install the update.

Lumia devices that’ll get the Windows 10 Mobile upgrade in December include the Lumia 430, Lumia 435, Lumia 535, Lumia 540, Lumia 635, Lumia 640 and 640 XL, Lumia 735, Lumia 830 and Lumia 930. Though it is worth pointing out that past flagships that include the Lumia 1020 and Lumia 1520 are surprisingly not a part of the list scheduled to get the Windows 10 Mobile upgrade.


  1. Are you sure that the 1020 and 1520 will not be receiving the W10 upgrade? If they have the Denim firmware update installed (they definitely meet the minimum RAM requirement), I would hope they would update. Perhaps MS only listed newer models, even though many people still use the former high-end phones. The 920 was also left off the list, but many people (myself included) have been running the W10 previews on the 920s and other models not on “the list”.


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