You may head up to this discussion page
The Nokia 3.1 Plus update error: How it happened and how we’re fixing it — Nokia phones community
And Read - The solution: Resolving the problem with a software update
Hope you get clarity on this regard.
Got a Nokia Nokia 3.1 Plus and keep getting a message to update. Have been trying and phone keeps showing not updated
New update has arrived with August security patch. After restart it is installing 5 October 2020 patch also.
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