No way to login VMG8825-B50B

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Hello!
there is no way to login on the VMG8825-B50B. I got in with the default pw printed behind and resettled it. After the reset I can’t login with the default password printed (neither with other ones like admin, 1234 etc). I manually resettled it many times but there is no way to login. How is that possible? Every time I get the message “the username or password is not correct or locked”

Thank you in advance.

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