Thank you, will try today.

Tnx;
It has "2018.3" on the small white square.

I have tried jumping the Reset pin to +3.3V, but it still reboots when I unplug the USB cable:

• Internal battery; powered on. Connect the USB cable = no reboot.
• Internal battery; powered on. Disconnect the USB cable = immediate reboot.

Hi all, I have purchased 4 units of M5 Stack, those gray color with MPU9250 to migrate some of my projects. It is a great product. However, what I find to be a showstopper is when I unplug the USB-C cable, the M5 reboots. It does no matter the battery is fully charged or not. The M5 are useless this way as I plan to use in a car, and the USB power comes from a converter using switched 12V wire. All 4 units behaves the same.

I would like to know if this is a IP5306 issue, or a USB DTR/RTS issue. Also the way to fix this.
Without this issue, it is the perfect encased unit for my projects.