This eMMC module does not have pre-installed OS. It is suitable for ODROID-H2, but also XU4 , N2+, M1 and C4.
To install OS on the eMMC module see OS Installation Guide.
For ODROID-H2, after attaching the eMMC module to the H2, connect the USB stick with the OS installation image to the H2 and install the OS in the eMMC.
More information is available on the website of Hardkernel.