Questions about SoFlow SO4 Gen 3

In Switzerland, up to 500 watts are permitted. However, there are various factors that are necessary for approval. These can be read about here: https://www.astra.admin.ch/astra/de/home/themen/verkehrsregeln/vorschriften-trendfahrzeuge.html However, I would advise you to buy another product, because in my view Soflow unfortunately combines a bad product with even worse support.

It's good on the flat, but the engine is weak when going uphill

The German translation of your question reads rather strangely. I don't know what a magnetic brake is, but I can say this: The brakes are the only thing on this e-scooter that is really bad. I just have problems with them. =(

The battery is permanently installed. Unfortunately you can't remove it, it has to be plugged into the bottom right-hand side of the scooter and charged. However, I thought this would be possible with the more expensive SoFlow models...but you would have to check again.

The scooter will survive a simple gravel road. But I wouldn't take it on an off-road tour.

I recommend Abus Ivera 7200

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On downhill slopes, it can quickly reach 40 km/h. But then I recommend opening both eyes and ears very wide, because road users can hardly hear you and only see you late. It can manage gradients of over 15% at around 5-8 km/h. Anything over 20% is no fun and you will probably have to push rather than ride (depends on your body weight - 90kg as a reference).