For those who don't know it, you CAN fly your drone at Red Rock Canyon. It's one of the few "national parks" that is the exception and in my mind, proves a sensible policy on flying drones can work at some national parks rather than having a...
Sorry NO there is no way to "restore" it.
If you are the original purchaser and have simply lost your password, You can contact DJI, They will send you a code that will allow you to change the password.
If you are NOT the original purchaser or...