Hi guys i've been directed here by several posts on the web concerning mk4 sat nav issues, so mine has just bricked itself (i think) during firmware upgrade, i bought the unit used and was fully working with a custon version 32 firmware installed, but my map disc was 2009, so i bought a new 2015 disc with speed cams etc but this needed a new firmware update the supplier called v32.6 so i followed the instructions drivers door open, key to position 1 waited for the nave to fully boot, ejected the map disc, installed the new firmware disc the messgage came on screen cd rom detectected loading firmware (or something like that) then the screen went blank and stayed blank, the nav unit power led was blinking during the whole process and when it finished ejected the disc, still with led blinking so i pressed right button and unit seemed to reboot. but i still have a blank screen.

when i start the unit i get a slight white flash across the top of the screen and i can see it's back lit, and turning right knob and selecting items works, even though i can't see anything. i have tried several times now to load a v23 firmware (each time it has a blinking led whilst reading the disc) then reboot then reinstall v32.6 (the supplier has sent me another disc which he has tested on his own unit with photo evidence) so i know i must have a good os disc. had the unit out of the car for 48 hours then put it back in this morning to no avail, currently got battery disconnected which i will reconnect in a bit and try. anything else to try or is my unit toast?