These are the easy steps:
1. Get your hands on a windows 10 install (so an iso for PC), i used en_windows_10_pro_technical_preview_10074_x64_dvd.iso (download it from http://windows.microsoft.com/en-us/windows/preview-iso )
2. Open the iso with 7zip (or any other program that can look into ISO's)
3. From the folder "sources" copy everything except the subfolders and the 2 biggest files (you can copy them ofcourse, but it will take less time if you skip them) to a folder on your PC. I put everything in C:\w10install . I am not sure which files are actually needed but just copying dism.exe and some dll's didnt work. So thats why I copied the whole directory.
Note: Apparently MS has put a new ISO (Build 10130) on their site that does not contain a required file called "FfuProvider.dll". If you get "Error: 0x80004005 Unspecified error", you need to do this extra step. Please see this post : viewtopic.php?p=770733#p770733 from MBRO95
4. Copy the file Flash.ffu that you downloaded from the Microsoft site to this same folder. (this file is within Windows_IoT_Core_RPI2_BUILD.zip, that can be downloaded from https://connect.microsoft.com/windowsem ... /Downloads )
5. Start a command prompt (run as administrator)
Type the following commands:
And note the number of your SD card
6. Then type:
dism.exe /Apply-Image /ImageFile:flash.ffu /ApplyDrive:\\.\PhysicalDriveN /SkipPlatformCheck
Where the N in PhysicalDriveN is the drive number from the previous step.
Note: Flash.ffu might be with upercase F, so make sure you check. Please make sure that you use the exact name of flash.ffu as it appears on your disk.
Note 2: Also make sure you are using the right dism.exe, so the one you just extracted from the iso file. See this tip:
The image will now be written to the SD cardGerritV wrote:If you are in the directory where the presumably correct dism is located, add .\ in front of the command to be certain that you are executing the one in that directory and not from the Path setting.
Thats it, now put the SD card in the Pi 2 and wait a while, it will boot up to Windows 10 IoT. The first boot will take quite some time, so have a bit of patience