Finally I did it !! Actually only one ROM is working: V10.0.1.0.OEBCNFH
You can find it on: https://sourceforge.net/projects/xiaomi-eu-multilang-miui-roms/files/xiaomi.eu/MIUI-STABLE-RELEASES/MIUIv10/xiaomi.eu_multi_MI8SE_V10.0.1.0.OEBCNFH_v10-8.1.zip/download
Then follow the usual...