As Nike says: Never stop running, we never stop providing the best experience to all Mi Fans. To achieve better system stability and optimization,
we have released the last Development/Alpha ROM 8.4.26 for MIUI 9 on 27th April 2018. Thereafter, MIUI developers will focus on system optimization, which will continue for a period of time. It's expected that
the update will be resumed in June and we will keep you updated.