Since a dedicated "IB250MH" manual is rarely published separately, you should refer to the for the systems that house this board:
Before diving into the manual specifics, it is critical to understand what you are working with. The is based on the Intel B250 Chipset (sometimes a variant of the H110 or B150, but B250 is the most common). This chipset was released in Q1 2017 to support Intel’s 7th Generation "Kaby Lake" processors, while remaining backward compatible with 6th Generation "Skylake" CPUs. ib250mh motherboard manual
He smiled, lit a cigarette under the awning of a Pachinko parlor, and thought about the remaining twelve IB250MH boards still out in the world—in dusty office closets, in basement gaming rigs, in industrial controllers for systems no one remembered. Each one quietly counting down the hours. Since a dedicated "IB250MH" manual is rarely published
The board follows a standard m-ATX layout (244mm x 200mm): He smiled, lit a cigarette under the awning