@Grispoil,

Let me reconfirm that by using this one Garmin USB cable on my Nuvi 1340T it completed the update and I no longer have this problem with Garmin Express telling me there is an update.

If I recall this happen over 1 1/2 years ago on this one older nuvi I have.
This series Nuvi's are old and do not get any updates any more unless you signed up to received maps which I do not have map updates any more for this Nuvi.
It has a route-able Openstreet EU map on it.
That is all.......


Garman_Nuvi spells out were the problem comes from.

Why it updated my Nuvi 1340T successfully after many tries using Garmin Express who knows.
But the problem gone......