Windows 10 Mobile build 9879

6.4.9879.0.fbl_release_kitp1_kitp2.141205-0813
Build of Windows 10 Mobile
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OS familyWindows NT
Version number6.4
Build number9879
Build revision0
ArchitectureARM32, ARM64
Build labfbl_release_kitp1_kitp2
Compiled on2014-12-05
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Windows 10 Mobile-6.4.9879.0-About.png

Windows 10 Mobile build 9879 is an internal build of Windows 10 Mobile, which was first uploaded to BetaArchive on 6 January 2020 as an FFU for the Microsoft Hapanero RX-130 engineering board in both the ARM32 and ARM64 architectures, and then later shared as a raw eMMC dump from a Lumia 1520 prototype device on 5 November 2024.

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