Mi5c conectivity problems with 3g/4g networks. 3g/4g was working fine on xiaomi.eu_multi_MI5c_V8.5.3.0.NCJCNED_v8-7.1
Anyway thanks for the job!
Edited: Reinstalled and once opened again the 5 modes operation in engenieering mode (*#*#1#*#*) I have quite good speeds in LTE and 3g (H)