I might post a new thread, but it’s all been done and covered before. The older 4.8 instructions explain the procedure for both Mac and pc users.
If your screen is dead;
Look for someone in France selling replacement screens on eBay (though it does depend on the 24/192 board which iirc is standard in the uq2)
Or buy a wireless access point and wire it off that, as I think navigating the setup menu might prove challenging.