Sudden loss of power on battery

Hi

I have an hexacopter with the 3DR PX4 autopilot. Today I tried to fly it with a Nano-Tech 5000 mA battery 25-50C discharge and after less than one minute fly, voltage lowered to near 7 V obviously the drone came down, fortunately with no major dama

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HKpilot32 not working

I have a HKpilot32 board and yesterday I got a solid red led, and it is not working at all

I flashed it two times, with no success.

It also connects to Mission Planner only from Terminal (no other way) and I got after the instruction sh/etc/init.d/rx.a

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