Windows 8.1 build 9299

Windows 8.1 build 9299 is a Milestone 1 build of Windows 8.1. An x64 checked/debug version leaked to BetaArchive on 2019-03-30. Due to its earliness, it still identifies itself as Windows 8 in many places and the kernel version is still 6.2. It is currently the earliest leaked build of Windows 8.1.

Blank Screen on Boot
This build often boots up to a blank screen after logging in, instead of loading the start screen directly. Pressing the Windows Key can load the start screen and allow the user to continue.

Timebomb
Like most Windows 8 builds, this build has a semi-broken timebomb, which gets nulled if you install on current date. If you do that, you won't be able to change the wallpaper, unless you use a tool like DeskImg.