https://www.theregister.co.uk/2018/11/15/xiaomi_early_buyers_wait_for_modern_firmware/

Prospective phone buyers may want to wait before plumping for a new Xiaomi. The newcomer’s flagship ships with MUIU 9 firmware, which is stuck on 2017’s Android Oreo.

Up-to-date global firmware, MIUI 10, isn’t yet ready for the UK yet - although Xiaomi told us it will be forthcoming soon.