I think this KB have wrong statement ..

Hi All,

refering  to https://kb.juniper.net/InfoCenter/index?page=content&id=KB30461 it said "2017-06-22: Added that no need to reboot after 15.1X49-D70." but even i'm use D80 it still need to reboot. Hopefully someone from juniper can make this correction

[edit]
root@SRX320# run show version
Hostname: SRX320
Model: srx320-poe
Junos: 15.1X49-D80.4
JUNOS Software Release [15.1X49-D80.4]

Thanks