New M3 SKY MC-7xxS with Summit WLAN module has a backup battery rather than a RTC coin battery. All models manufactured after M3 SKY SUMMIT has a backup battery.
When booting the device for the first time, must reset the CPU by power-cycle before power it on. Without CPU reset, the device may not turn on due to low back-up battery which is discharged during shipping.
It is designed to act like that; not a faulty device.
To reset the CPU, please follow two steps below to perform long reset.
Attach fully charged main battery or connect the AC power cable to the device.
Press and hold the reset button for at least 5 seconds.
It will automatically reboot. Otherwise, press the power button.
