I'll try updating it to the other one tonight see if that works.
The one i currently have is dated 2016 so i really need to update it, several thousand homes and streets been made where i live so needs an update.
If it's a Plus unit you can't update the maps yourself without Mapcare or having it made into a retrofit by a specialist. Mapcare isn't sold in the UK. If it's a standard unit you can use the workaround method with the overall.nds file of the working system but obviously you need the system working on the SD card that came with the car. Hence you need to determine whether it's a Plus. They were sold at a premium of about £800 extra so most people made do with the standard. The latest Seats dont have Plus units as an option in the UK, that's kept for the Cupras only. You wont find them on My19 cars.
On missing estates etc, I do submit to Google, Here Maps and TomTom plus Openstreet. They all have missing things. Google in these parts are tight with their satellite images using old ones which make it near impossible to accurately draw them on. Several developments I know about.
Here Maps use the most recent images so you can submit them. TomTom allow you to mark on a map without the satellite image so you put a blob on, give the developers web link and tell them to look at their most recent satellite images.
All local authorities have detailed low level OS maps that are used for survey purposes, they are the gold standard of what is on the ground after the development.They also carry rough street numbers. They are commercial but some LAs have them available on their sites, it's those that you wack the car routing people with that's if they provide the screens to do that with.
Openstreet was good but the free local detailed OS cartography was discontinued so crowd sourcing on that has stopped since they have old satellite images and can't crib detailed OS local level data that was free. They don't have the money to put the commercial maps up to be used for crowd sourcing via tracing.
Lastly all the commercial routing providers have the survey cars going around. Online providers may be more up-to-date but isn't the case if they use sat images to verify submissions but can't do, so reject them, that being Google. That's where Google's validation process fails. Ive submitted roundabout but they wont put them on if they cant validate them. Google is a bit of a joke in this respect.
Take a picture of the information screen and I'll know exactly what it is.