Nighthawk M1 EUS: 4x4 MIMO Support?

In the german PDF, there is a List of Band with 4x4 MIMO Support: 1,3 and 7. But the M1 supports the 2600 MHz TDD Band too. Can the M1 use 4x4 MIMO on Band 38 too? Band 7 (2600 MHz TDD) and Ban...