miui v9

I was using the v8.2.1.0 v8-5.1 rom for a long time.Earlier today I have installed the latest v9 rom through TWRP following a basic factory reset.since then every time I try to reboot to system, it comes back to the twrp mode.The version of twrp is 3.0.3-0.Even I tried install the previous rom...