Why does my drone flip?

The Promark P-70 Shadow drone manual states to place the drone on a flat surface, are you doing the gyro factory reset procedure? Reset is important prior to all flight attempts. Remove all props and check the shaft for any debris grass, hair, string can get tangled which will cause friction and a potential crash. Are your props in like new condition, no cracks or broken pieces missing? Pre flight inspection of all props is critical for a safety, always fly with GPS lock enabled. Flying manually no GPS is potential for a FLY-AWAY.

The gyro is out of sync the cause may have been a previous crash, hard landing, or not placed on a level surface. To correct this problem you must do a factory gyro reset. To reset your VR Drone first turn on the transmitter STATUS blinking next power up the drone now push the left stick up then down to pair transmitter to the drone. STATUS should now be on stady not flashing. While holding down the RESET button move both sticks to the left then down you will hear a confirmation beep the gyro is now factory reset. Make sure to place the drone on a level surface prior to attempting flight.

I was givem a drone by my neighbor, no box, spare parts, not manual. Best part is, there is No branding and it looks like about 100 different generic cheap drones, so no clue what it is.

Anywho, upon taking off, EVERY TIME, the props start spinning up and just at lift off it wpuld flip over backwards. I started messing with the propellers, chamging them around, making sure the front left prop looked identical to the back right propeller (meaning left half would slant forward and the right half of the prop would slant backwards) which also made the right front prop match the back left. Next time i fired up, it lifted off beautifully. Hope this helps ya.