You can check the 300mbps wlan adsl2+ router login default Pages below in the list, visit these official websites and login to your account by following the guide below.
https://www.askmefast.com/300Mbps_WLAN_ADSL2__Router_Login_password-qna9222779.html
https://phnewsbox.blogspot.com/2016/10/pldthomedsl-300mbps-wlan-adsl2-router.html
https://www.askmefast.com/How_to_find_a_user_name_and_password_of_PLDT_300Mbps_WLAN_ADSL2__Router_Login-qna9393528.html
https://tutore.org/300mbps-wireless-adsl2-router-login.html
https://alebiafricancuisine.com/the/46093-300mbps-wireless-adsl2-router-username-password-24-361.php
https://tipidpc.com/viewtopic.php?tid=311446
https://static.tp-link.com/resources/document/TD-W8961ND_V2.0_User_Guide.pdf
http://download-c.huawei.com/download/downloadCenter?downloadId=35164&version=61011&siteCode=worldwide&view=true
https://www.downloads.netgear.com/files/GDC/DG834GV5/DG834Gv5_SM_31Mar08.pdf