Here is the command, please connect IR302 with computer then test with cmd:
curl -u adm:123456 "192.168.2.1:4444/reset-default.cgi" -H "Content-Type:text/plain"
Note:
adm is the username
123456 is the password
192.168.2.1 is the LAN IP of IR302
reboot the device after performing the command