The file you download will have an .img.xz extension. This is a compressed sector-by-sector
image of the SD card.
STEP2. Install compression utility and decompress the image
Download and install 7-zip. http://www.7-zip.org/download.html
Note
Choose a version that suitable for your system.
Use 7-zip to decompress the SD card .img file
STEP3. Install SD card programming utility
Download and install Image Writer for Windows. Be sure to download the binary distribution.
https://sourceforge.net/projects/win32diskimager/files/latest/download
STEP4. Write the image to your SD card
You need a SD adapter to connect your microSD card to your computer at the first. Then use the
software Image Write for Windows to write the decompressed image to your SD card.