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That depends on the content. If it's just Freeview, then there's no problem. If it's subscription TV, then the box needs to confirm that you still have a subscription to watch that channel.
If you are simply moving from the old Vision+ box, to the new YouView one, and you have completed the minimum contract on the old box (which you must have by now), then you can keep the old Vision+ box, as you now own it.
It can still be used as a FreeView PVR, without needing an Internet connection, so you have plenty of time to watch any existing FreeView recordings.
BT have to send you a returns bag or box, so they can recyle it, but its not compulsory to return it.
the answer marked as the solution is i believe actually an accurate correct answer to your orginal question so it does make sense for it to have marked as the solution.
As i understand it all Youview boxes should be software updateable unless they are faulty. The range of maintenance mode and factory resets available are quite extensive .. although some of the more severe resets will also delete existing recordings
If your Youview box that you are replacing is still workable then you can continue to use it and use the freeview element without an internet connection, That includes making freeview recordings (subject to an aeriaL) and playing back any existing freeview recordings, Note that assuming your existing and new (replacement ?) Youview box are Humax or BT badged boxes the remote for both boxes will operate both boxes so be careful if you have both boxes in the same room powered up at the same time.