No puede estar rooteado el smartphone

y debes tener esta rom stock PHE :
Model SM-A320FL
Model name Galaxy A3
Country Spain PHE
Version Android 7.0
Changelist 11969634
Build date Tue, 01 Feb 8157 11:51:40 +0000
Security Patch Level 2018-01-01
Product code PHE
PDA A320FLXXS2BRAA
CSC A320FLPHE1BQH5