I have been playing around with the DragonBoard 410C this morning. I followed the tutorial on this PDF (http://www.seeedstudio.com/document/pdf/LinuxUserGuide_v5.pdf) and failed at this command:
fastboot flash sbl1 sbl1.mbn
However, I continued to do the rest of the tutorial. After finishing, it could not boot (completely black screen, I guess I messed up somewhere) but now, I cannot turn on fastboot anymore (fastboot devices shows nothing). Can anyone show me what is the problem here? I would be very appreciated.