Good morning fellow hobbyists,  I have a 250 model and when all is set and ready to fly, the quad is armed and a small amount of throttle is given, the motors start to spin at an increasing exponential rate.  I erased the settings and did a flash and all the usual steps but to no avail....
This problem is the result I crashed it the first time and I don't want to do so again.
Please help me out.  Many a thanks in advance....

Set your min throttle according to your tx. Thats what fixed it for me.