How to wifi Password Change 8546m Xpon Device

user name. telecomadmin password. admintelecom GPON ONT HG8546M Optical Network Terminal GPON ONT, 1*GE, 3*FE, 1*POTS With WiFi, 1*USB Connector type SC/UPC Compatible with Huawei OLT that supports OMCI GPON port: Class B+ Module Antenna gain: 5dBi Can be configured by OLT or Web or NMS HG8546M coming with English GUI