downgrade 8.0 to 7.0

help me for downgrade firmware and modem

Searching Samsung modem... detected COM127
Reading phone info...
Model: SM-A320FL
AP version: A320FLXXU3CSA3
CSC version: A320FLNEE3CSA3
CP version: A320FLXXU3CRJ1
Product code: NEE
Phone SN: RF8JA1V4T2F
IMEI: xxxxxxxxxxxxxxx
Unique number: CAJ00F075FE3EA4
Reading IMEI... OK
IMEI: xxxxxxxxxxxxxxxx (SIGN: UNKNOWN)

Done with Samsung Tool PRO v.36.2