List preferred MinnowBoard firmware revision

We have recently had issues with older revisions of the Minnowboard
firmware, resulting in a 5 minute pause at boot (due to the addition of
reset attack mitigation functionality in newer versions of Linux).

We are in the process of updating boards to the latest firmware available.
Document the version that we are using and recommend that others update
their firmware.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/reference_hardware/minnowboard_setup.md

@@ -94,6 +94,11 @@ fix issues with the hardware, such as no HDMI output or both LEDs
 on.
 [Download it and apply it from the Intel website](https://firmware.intel.com/projects/minnowboard-max).
 
+{{% notice info %}}
+Apertis is currently being tested using the `MNW2MAX1.X64.0101.R01.1908091048`.
+It is recommended that Minnowboards are updated to at least this version.
+{{% /notice %}}
+
 ## Setting up a Minnowboard device for LAVA
 
 ### Overview