What is Zyxel VMG3625-50T(ABM6C0) default username and Password for login ?

i just update my router with model VMG3625-50T(ABM6C0) now i cannot login my router any more , i already reset my router after updating software , i tried to login with login credentials printed on the back of my router but it is useles,s ,i tried with username admin and password 1234 and all common usernames and passwords but still the same problem ,can any one help me with this issue ?

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