I've been through each of those recommendations but I still can't get there. If I press and release the power button when the unit starts, it goes straight through into trying to load the maps. If I press and hold the power button continuously, I get the screen calibration screen come up, but then it eventually goes into the map loading sequence and then fails. (All this is of course while pressing in the bottom left corner of the screen)

At no stage can Updater see any UB device.