Hi, I also fly a Holystone HS720E, and not funnily enough I crashed it the other week. Pilot error, may post the video if I want a public shaming. Flew at too high a speed and a fatal indecision in direction caused a side slip taking it into a concrete building.
The crash smashed an arm out of the joint and cracked and damaged the top case, snapping off the on/off microswitch from the circuit board. Had to pull the battery to shut it down, earned a few nicks to my fingers from the blades as punishment, serves me right. Managed to get the arm relocated but unable to power her up without the microswitch.
Although I could attempt at sourcing and soldering in the switch, there’s the risk I could waste a lot of time repairing that only to find she has other issues.
I got a generous offer from the amazon dealer on a replacement so took that.
Other than my error seemed a lovely drone to fly.