You cannot update to xiaomi.eu ROM because you are using official Global ROM for Taiwan.
If you want xiaomi.eu ROM you have to install it with "Data Format" (your data will be deleted).
Installation instructions xiaomi.eu install Xiaomi drivers , fastboot and ADB 1- First, update the ROM to the latest using the updater. 2-Unlock the bootloader https://xiaomi.eu/community/threads/unlock_hyperos_-global-devices.71752/post-720918 3 -Download the ROM : Stable HyperOS 1.0 -...
xiaomi.eu
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If you want to continue using the Taiwan ROM HyperOS, install it using Miflash or in the Update app.
Attention, you must not lock the bootloader (Miflash is basically set to lock the bootloader).