Thats weird I use this method and the rom install ex perfectly
https://xiaomi.eu/community/threads/how-to-install-xiaomi-eu-rom-for-redmi-k40-poco-f3-using-twrp.61851/#post-618069
Only one thing be sure to do a backuo on the pc, I didn't do it and the phone's módem changes to Redmi K40 and the...