I'm a new user of Dragonboard 410c. I prepared every component ( HDMI monitor, usb keyboard etc.) and plugged in the device with and adaptor of 12V 2A. Firstly the BT LED flashed for less than a second and after a few seconds LED 4 turned on. Then I saw the android os on the screen and there was no problem, it worked fine.
I wanted the use Ubuntu Core on the devices and did some research. I found the installation on the official website of the Ubuntu. The link is as follows:
I did everthing in order. I wrote the Ubuntu Core into an 8 GB micro SD card. I turned the switch S6 as 0-1-0-0 and put the other cables and finally plugged in the device. But I had a problem that device again opened the Android OS. There was no boot screen or other things. I also tried the S6 as 0-1-1-0 as mentioned some videos. I thought that the problem was about the SD card but I also wrote Ubuntu Core for Raspbbery Pi 3 into SD card and with the same components, it worked fine and run the Ubuntu Core.
In the next day, I tried the booting device in SD boot but I had the same thing. Again Android OS opened there was no boot screen etc. After a few tries, Android OS didn't come up but also boot screen didn't come up. Then I tried the S6 as 0-0-0-0 but there was nothing in the screen and Android OS didn't come up. When I plugged the device, there is only BT LED flashes for a moment and nothing happens after that. I measure the voltage values and a 12 V at the socket. There is 1.8 V in the 35th pin etc. Problem is not in the power, sd card and monitor beacuse they worked fine in the Raspberry Pi 3. I don't know what to do. I did some research and found few person that has the same problem. Their links are in the below:
I should also mentioned that I tried the fastboot mode and my PC didn't see the Dragonboard.
I would be very happy if anyone can help me. Thanks for all.