X1800 - Cannot reach update mode with BACK + FX CUE + TAP

I picked up a second x1800 recently and the windows updater claims it’s on firmware version 0.0.4. I’ve never seen a firmware that low before. Anyhow, I’ve tried to update it with the main installer and get as far as “Your x1800 is resetting”, but then a another message pops up; “ The update has failed because the device cannot be accessed. Unplug and replug in the device and click TRY AGAIN”. Tried updating the control surface as well, but I can’t get passed the point where I’m supposed to power off the mixer, press and hold “BACK + FX CUE + TAP”, then power back on, because the mixer boots normally and does NOT give me the “update firmware” option. Please help! I’m losing my mind trying to figure this out.

Holding down BACK + FX CUE + TAP while powering on does nothing…

Holding down the utility button when powering on gives this screen (never seen this before)

Holding down the utility and prime buttons causes the channel LEDs to “countdown”, from top to bottom (never seen this either). See video below.