Bought a Xiaomi 15 from TradingShenzen last year. In the beginning, I had some issues with some apps like Signal, Whatsapp, and Banking apps that didn't show their notification. I solved nearly all my issues after 2 weeks by configuring all my faulty apps like "Casse Bonbon" explained. Now, all my apps work like a charm: Google Pay, Banking apps, Signal, WhatsApp, etc. The only thing is that from time to time, a Chinese window appears at the bottom of my smartphone, related to the AI Chinese feature included in this smartphone. But I am happy about the phone: network attachment is fast (I use two SIM cards), stability is ok, speed is awesome, and the battery is endless. No real need to install a European ROM because all my apps are in the local language (french for me). I used SetEdit and changed the "system_locales" entry to fr_FR.