cheerson cx 20 bigshark gps take off problem

hello everyone.. can anyone help e .. with this  problem.. i just bought a cheerson cx 20 bigshark edition

i cannot take off in gps hold.. even if the gps is locked GREEN LED STEADY...the motors will not unlock..

but it i put sw2 in take off it will un

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HOW TO UPGRADE CHEERSON CX 20 BIG SHARK TO V2

hello, i tried  the usb connection.. but only s8 assistant  v1.2.1 the sees the quad.. and does not have the option to upgrade firmware..the other software flight tools does  not see my quad

how can i upgrade my quad.. firmware 

thank you

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