encyption upgrade

Hi all, i succesfully installer miui eu rom and encrypted sdcard. I currently have 8.0 Stable i.e. 8.5.0 (LXKCNDG) based on Android 5 Now i downloaded xiaomi.eu_multi_MI4c_V8.2.1.0.LXKCNDL_v8-5.1.zip and copied into the sdcard from the updater menu i can restart in recovery but obviously TWRP...