I assert this firmware was built by me from Motorola sources. However I've not tested beyond a single trial, which seemed to work. It could brick your MDK, or your phone, or your TV, kill your dog and burn your house to the ground.
Detach the MDK from your phone, remove any board or personality card
Set dip switches A1 & A3 to ON (i.e. closest to the camera cutout).
Set the remaining dip switches to OFF.
Reattach the MDK to your phone.
Launch MDK Utility.
Set the Mode to Developer Mode (if it's not already so).
Click Select FIle(s) and choose the MDK-COMPUTE firmware (nuttx.tftf) that you downloaded.
Click Perform Update.
MDK Utility will ask you to confirm you wish to install this unsecure (i.e. unsigned) firmware. If you are sure then click continue.
If you are in any way uncertain about this procedure, or the firmware then click Cancel.
In a few seconds you should get a pop up saying Firmware update succeeded.
Check that the Moto Mods Status at the top of the screen reads
Plug the Slimport adapter into USB-3 (micro USB) port on the MDK
Plug the HDMI lead into the Slimport adapter and your TV
On your TV select the appropriate HDMI input
Unlock your phone, the screen should now be mirrored on your TV
$ export PATH=$PATH:$BUILD_TOP/manifesto:$BUILD_TOP/bootrom-tools $ cd $BUILD_TOP/nuttx/nuttx $ make distclean $ cd $BUILD_TOP/nuttx/nuttx/tools $ ./configure.sh hdk/muc/compute $ cd $BUILD_TOP/nuttx/nuttx $ make