Disregard that post - it gets there but it’s convoluted.
Turn your machine off, remove your SD card and load it onto your computer. Get the latest firmware update, change the file extension to .upf and put it on your SD card.
Now, grab a T10 hex screwdriver and take off the right hand metal side of your machine. Then move the cables so they look like they do here: Firmware update hangs, emergency update also hangs - #3 by otobot
Once you’ve done that, put your SD card with the firmware in the back of your machine (while it is off) and power on. The screen will stay dark for a minute or so while the fw updates and then it will come back to life. Let me know how you get on please.