Hubsan Official Forum

Hello!
I have a problem whis my fpw2 transmitter h901a. (copter model H502S X4 DESIRE FPV)
there is no thorttle response whis my copter a i can't arm and disarm motors
Where can i download new wersion of transmitter software for upgrade it and fix this problem ?

Did you try to do the transmitter calibration as attached below?
Push both sticks to the upper left corner and power on the transmitter simultaneously.the LCD will display 'Calibrate stick mode 2"rotate both sticks in circles for three times ,release both stickers,then press any trim for 1.5 seconds until one "Beep"heard which indicates a successfful calibration.