My phone is Xiaomi Mi 9.
I use xiaomi.eu_multi_MI9_V10.2.16.0.PFACNXM_v10-9.zip.
I had an issue with the portable hotspot. it is not working on 4G.
if anyone have same problem.
try this. it works for me.
https://forum.xda-developers.com/redmi-note-5-pro/how-to/tut-hotspot-connecting-fix-t3796847