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Summary of HL669 programming videos
How to change the HL-300K programming code
How to add HL669 user code
HL669K default programming code, user code and auto-lock demonstration
Tutorial on How to Change the HL668 Door Lock Programming Code
HL669 restore default setting demonstration
How to set HL669 auto-lock delay time
How to remove HL669K user code
How to add a new user code(HL668)
HL669 Silent mode on/off demonstration
Standalone Access Control Keypad How to reset programming code
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Last Updated: August 22, 2026
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