Pixhawk 2.1 does not come up

Hardware Pixhawk 2
1

Please help,

my pixhawk2.1 does not boot after a uprgade.
How can i reset or factory-reset the device?

The device blink short green after power up, but then immediate blink fast red.
Sounds for my like a unstable power, but the battery is plugged in to the power1 slot.

is there a possibility?

thanks,
smilie

2

check if you didn’t accidentally disconnect your SD card, its right under the micro usb plug

3

MissionPlanner works QGC works not.

I get a idea from “MyPixhawk-forum” to use a trunk version for qgc, because the chibios-bootloader is new.

I try this and will post success or issues.

Thanks