Hey, if i will flash the Xiaomi EU version on my Mi 11 ultra, Will it get updates via OTA or will i have to flash every new update from PC again and again?
Updater app in Xiaomi.eu ROMs requires a custom recovery (like TWRP, OrangeFox, SHRP, etc.) to install new ROMs. For your device, after that the Updater app downloaded the new ROM, you need to manually reboot to TWRP (go in "3-dots" menu of the Updater app => Reboot to Recovery) and install the new ROM. Reboot your device after that.
You don't need to use a computer when a custom recovery is available for your device.
I'm using a Mi 9T (davinci) and the latest Weekly version by Xiaomi.eu.