Update: everything went well with the upgrade. Well almost: Flashed OS and everything worked normally, until I patched boot.img with magisk, and flashed it back then touch stopped working and battery indicator was showing 0%. Flashed back the original one, tried patching again and it worked. I was already on latest Magisk v29 so no idea what happened there. But at now everything works like a swiss clock, battery life is similar to MIUI14 with the uperf+granubess uv running. Thanks you Xiaomi.eu devs and community