Within 10 seconds after power-on, hold on the call button for 3 seconds to enter the setting state
The indicator LED keep blinking to indicate it enter to setting state and it will exit if there is no any action in 10 seconds
In the setting state, hold on the call button again for 3 seconds to initialize
Exit the setting state after setup
step1. 进入设置状态
按住DT616的Call键上电并保持3s，直到听到3次”BP”音后松开（每秒会响“BP”一声），进入主机生产设置状态，指示灯慢闪；DT616上电10秒内，按住Call键上电并保持3s，直到听到3次”BP”音后松开（每秒会响“BP”一声），指示灯慢闪表示进入主机设置状态；[此状态维持10s，10s内无操作自动退出]
step2. 出厂初始化设置
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