Windows 8 build 8061

6.2.8061.0.fbl_core1_soc.110803-1830
	Build of Windows 8
OS family
Architecture	ARM32
Compiled	2011-08-03
Timebomb	2012-03-11 (+221 days)
Works in
About
SKUs
	Ultimate

Windows 8 build 8061 is a Milestone 3 build of Windows 8. The WIM image dump containing this build was shared on 19 May 2023.^[1] It is currently the earliest available build of Windows that was compiled under the ARM32 architecture.

Patched/modified files[edit | edit source]

The following modified files are present in the dump:

winload.efi is from 6.2.8129.0 (fbl_core1_soc.111006-1700) and additionally has had signature checks patched out. This is because ARMv7 boot applications from before ~812x cannot be loaded by boot applications after ~812x due to internal data structure changes. This allows this build to be booted using a production-signed bootmgr (using donothingpolicy.pol and nointegritychecks enabled). The original version from build 8061 is located in Windows\WinSxS\Backup\arm_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35_6.2.8061.0_none_e22fc5a8e03359c9_winload.efi_75834aa0
acpi.sys is from 6.2.8129.0 (fbl_core1_soc.111006-1700) (unmodified, valid signature). This is because the version from this build is incompatible with the later winload.efi used. The original version from build 8061 is located in Windows\WinSxS\arm_acpi.inf_31bf3856ad364e35_6.2.8061.0_none_a991cf7a419448c9\acpi.sys
partmgr.sys has two jumps patched to prevent functions from returning STATUS_MEDIA_WRITE_PROTECTED. This is because (at least on Surface RT hardware) every partition is seen by the operating system as a read-only/write-protected file system. Despite this patch, the eMMC is still mounted read-only, and so the build must be booted from a USB drive (using VHD boot is possible). To mount the eMMC read-write, sdbus!SdhcIsWriteProtected must be patched to return 0 (and the PE checksum fixed): patch file offset 0x138 to db e2 01 and file offset 0x6c24 to 00 20 70 47
testplugin.dll is re-signed by a certificate named 'DesktopApp'

Bugs and quirks[edit | edit source]

Chess Titans and Mahjong Titans will fail to launch as the respective English language pack resources for the built-in Windows 7 premium games are not present in the image.
Desktop Window Manager software-based compositing does not work by default unless a Terminal Services client such as Remote Desktop is used.