need some help with apm2.6

i just got my apm2.6 . there was no setup that came with it. so i didnt know what to do . so i got on youtube look easy. so i try it .  didnt work . i got APM Planner 2.0 so far so good the next step was to download  firmware for quadcopter . witch i have a x525 quadcopter .  i cant get the firmware to start there a 

message.

「no valid device found.
check to be sure your APM2.5+or pixhawk/px4
device is plugged in, and drivers are installed.」

is it my computer as it is win 8 that i cant download firmware ? the apm2.6 it light up with red and blue blinking and a yellow light say gps the blue light will stop blinking then just the red will blink. i try other cable . didnt work . im am so lost . then i found this site . 

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