I only have a nuvi 3597 with voice command:announce:
Printable View
I tried it on my Nuvi 40 with the D5160130A.JCV file, and can confirm that it DOES NOT work. I simulated a route and at the usual 1.5km before the junction view image is supposed to be shown on the screen, my Nuvi 40 just switches itself off completely. I tried it again, same result. I then removed the D5160130A.JCV file from the JCV folder and again simulated the route and did not switch of at that specific point on the route. I had the older D3530450A.JCV file in the JCV folder, but it did not show up, which was to be expected.
So I have reverted back entirely to the 2019.2 version map until a download link for the D3530250A.JCV file becomes available.
Same problem using Garmin Express to update Nuvi 40 with Lifetime Maps.
It appears there is a software problem with the 2019.30 Junction View Files (JCV) of the Southern African Map. When the device need to display a Junction View, the Nuvi 40 restarts.