For the user, please perform the steps listed below for one time.
1.
Suppose that mOTP has been successfully installed on your iPhone (we will not
introduce the installation here). Open it and press the button Generate Secret to
initialize your secret key. Don't do this if there already is a secret key existed, otherwise
it will re-initialize your secret key.
2.
Shake your iPhone to generate a random secret key.
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Vigor2820 Series User's Guide