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Can I replace the telecom optical modem with one I bought myself? I used a second-hand TEWA-750G to complete the entire LOID registration process: where the sticker password is, what error would occur if one of the three authentication elements was missing, WiFi reset after registration, what to do when ITMS comes to reunite late at night, plus honest advice about people not to mess around—copying it saves me a trip to the service center. ...