Upgrade firmware for your HomeKit devices! We have released new firmwares for HomeKit devices to drastically improve the connection stability. Please refer to www.meross.com/support/FAQ/447.html and upgrade your HomeKit devices.
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My smart 3-way switch MSS570 turns off automatically after it is turned on.

This means that you have connected the load wire to Traveler-1 on the additional switch. Reconnecting the load cable to Traveler-2 will resolve this issue.

In addition, please refer to the installation video to check the wiring, if required.

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