Strong SRT 4300 User Manual page 16

User Settings
System Setting Lock: To lock the System Setting menu to prevent unauthorized
adjusting of System Setting.
Channel Lock: To lock the channels to prevent the channels that are not suitable
for Children.
Receiver Lock: To lock the receiver to prevent from unauthorized watching.
Factory Default Lock: To lock the Factory Default menu to prevent unauthorized
operation.
You can also change the password by input numeric key for NEW Password,
and then repeat again to VERIFY Password.
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