Windows Phone 8.1 build 12075

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8.10.12075.209.WPB_EXP_OFFICE(wpbldlab).20130428-1100
Build of Windows Phone 8.1
8.10.12075.209.WPB_EXP_OFFICE(wpbldlab).20130428-1100
OS family
ArchitectureARM32
Compiled2013-04-28
Timebomb
Works in
Base build
6.3.9379.0.fbl_partner_mobile.130408-1200
About
12075 9379.png

Windows Phone 8.1 build 12075 is a build of Windows Phone 8.1. It was leaked on 2020-01-03 by gus33000. It is based on Windows 8.1 build 9379.

Bugs[edit | edit source]

  • The NTFS driver is heavily unstable in this build, which may cause the following bugs:
    • While installing, this build has a high chance of wiping the eMMC of the device you install it on.
    • If you install the build, it will most likely corrupt the NTFS file descriptor, making it look as if there are 0 files on the drive.
    • This build is capable of writing garbage data at a random location on the eMMC if boot fails. This includes the UEFI and the bootloader. If this happens, you will need to re-flash the eMMC.

Particularities[edit | edit source]

This build of Windows Phone 8.1 incorporates many features rumored at the time, such as:

  • A Notification Center application
  • The ability to sort the application list by most used
  • A couple new versions of some system apps marked with a "z" in front of them
  • An early version of Cortana, Microsoft's own Digital Assistant

Sadly the version of Cortana included cannot be used anymore nor seen because the servers for Microsoft Account login used by this build have been taken offline.

Gallery[edit | edit source]