Cheeron CX-20 Pathfinder won't lift...Help!!

Hi all! New here and a friend gave me his Cheerson because he couldn't get it to lift, motors would spin but that's it.  Its an open source, I downloaded Mission Planner did all firmware stuff, calibrated the RC and while hooked to the computer doing motor tests they will spin at different rpm's but as soon as I unhook it, put it on the ground, arm it and try to take off it won't lift.  The motors just spin at one speed no matter what I do!  This is very frustrating and can't find anything on the web for a fix.  I have other quads but this one is very new and still complicated lol.  What do I do??? Any help is greatly appreciated!

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