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Within 10 seconds after power-on, press and hold the Call key until the "BP" sound is heard for 3 times and then release it (the "BP" sound will be heard once per second) to enter the unlocking time setting state, and the indicator light will flash slowly;
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Within 10 seconds after power-on, press and hold the Call key until the "BP" sound is heard for 6 times and then release it (the "BP" sound will be heard once per second) to enter the unlocking mode setting state, and the indicator light will flash quickly;
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