Good idea.
No, dont have one small enough. I think the ones I have tried are 2gb and 1gb.
I might try and find somewhere that sells 512mb, PC world doesnt do them checked yesterday.
It should in theory still do the update and say update complete if it has the new software on (according to the instructions).
I dont think mine does have 5.4 because I plugged my iphone in via the adapter and nothing happens it just charges.
It does say 'media player' when you have usb stick in with mp3 on.
Looking at the upgrade files itself there is no 9093_P folder where there is a folder for 6314_P which is what I have.
Dont know why this would be!! Maybe it already has 5.4 so its not included in the update file.
Ive booked mine in with the dealer to be sorted. Strange I keep getting usb error because Ive managed to install eco drive and I have tried a brand new usb for the update (which fiat.co.uk forums keep tell everyone to do)