First, connect to the optical modem WIFI to ensure you are in the optical modem LAN.
Go to http://192.168.1.1/romfile.cfg to download the file and open it.
Search for web_passwd
, find this line
<Entry0 Active="Yes" username="CMCCAdmin" web_passwd="CMCCAdminGj6y*Jv" display_mask="FF FF FF FF FF FF FF FF FF" Logged="0" LoginIp="192.168.1.2" />
Super account=CMCCAdmin
Super password=CMCCAdminGj6y*Jv