When I purchased my Samsung Tab A it was on the Marshmallow OS 6.0.1. A few weeks ago I received a software update which put on Nougat 7.1.1 on my tablet. If I do a factory reset what OS will then be on my tablet? The update to Nougat 7.1.1 causes some issues on my tablet. Thank you.
Factory reset only erases everything and restore your tablet to manufacturing settings of the OS you are having now.
Downgrade OS, you need to use Odin to flash Marshmallow firmware. If you don't know how to use Odin to flash firmware, then don't try. It takes only 5 minutes but not recommended to newbies.
Tab A has different models and sizes, you need to be specific of the model.
If you said you have a Toyota , nobody has any idea of what kind of car or truck you have.