Error trying to update Gio @5 to 3.1

Just tried a couple of times using 2 separate memory sticks to update the desk to 3.1 and failed both times.
MAY be the size of stick as I seem to recall that the desks don't like them to be too big, but not 100% sure on that.

The first was a 128GB drive, the second a 16GB - any thoughts on that as an aside?

But the error suggests something different.

So - thoughts on this one then please.

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