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Hi @ juhyun0782 , have you tried to hard reset the modem? If yes and you're still experiencing the same issue, please send us a private message with your TPG customer ID, username and complete address so we can pull up the account and help with your concern.
To send a PM, please refer to this link: How do I private message (PM) in the community
I understand, @juhyun0782.
We'll wait for your details via private message in order for us to assist you accordingly.
Regards,
Ahra_G