Hey Markus, I live in Australia. All connectivity is working with the new board. I gave the phone with a new motherboard to my dad, and he has been using it everyday for about 2 years now. Still have the old motherboard in storage. I will have a look at it one day under the microscope to see if I can diagnose it. I bought my board from this seller: 128GB Unlocked Mainboard For Samsung Galaxy A51 A515F A515DS A515U Motherboard Full Chips Original Logic Board EU version https://a.aliexpress.com/_mtNkZh4 It works great in Australia. Network strength is as good as it can be. The seller advertises it as a EU version, so if you're living in Europe, it should be suffice. Good Luck Boaz
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