I installed MIUI 8 (MIUI 8 by xiaomi.eu, version 6.8.25) via TWRP and I dont like it. Battery drain, push notifications are late, battery saver app, new security... I tried downgrading it to MIUI 7 via TWRP, I made it, but nothing is working :/ NO SIM card, bugs, launcher is force quitting. Can someone please explain how can I downgrade it from MIUI 8 to MIUI 7 so that everything works again?