Perfect thanks. I’ll take a look when home
I hope you got this sorted out. I had exactly the same issue. Come on Samsung, this is a premium product at least have a few flashing lights telling us what is going on. Is the file corrupt, can it not see the file, wrong format, incompatible USB drive, file structure?
I ended up trying 5 USB drives I had , all of differing sizes and types including ad SD card, formatting them to Fat and just having the firmware file on but every time I got the same symptoms as described. Fans on full, orange lights for a few seconds then power off. Trying to write a logfile gave the same results but in this case the PJ just stays with full fans on and 2 orange steady lights, with the manual saying never touch it until it's finished or you might screw up the PJ and it won't start.
I eventually found an old 4gb USB drive and finally managed to get it to work. My guess is that it has some sort of arcane drive size limitation. I'm not sure as there is no info or help on this from Epson. Why do Epson thinks that someone buying an expensive PJ would need a 12 year old USB drive in order to flash the firmware?
Anyway, I hope this might help someone having the same trouble as I did. Persevere and use the oldest USB drive you can find.