I'm going to shortchange you here. It's a good question but has been asked many times. You have to decide if it's worth the effort and risk. Do some reading at say "XDA Forums" on your model and see if there is a way to root it, and possible replace the ROM.
Again, sorry if you feel shortchanged but it's a common question.
Bob
How do I remove unwanted apps. from a Samsung Galaxy slll mini

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