New M3 SKY MC-7xxS with Summit WLAN module has a backup battery rather than a RTC coin 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:
1. Attach fully charged main battery or connect the AC power cable to the device.
2. Press and hold the reset button for at least 5 seconds.
3. It will automatically reboot. Otherwise, press the power button.
