I've tried a whole bunch of things to downgrade and get back to drone that can fly to the specs that it says on the box. After this new update (1.5.7) a lot of people are complaining about signal loss at low altitudes, botched updates and now they can't complete the update because the system thinks it is completely loaded, battery issues and instability during flight. I've been going through old posts and something interesting came my way, a special bin file that wipes the system and allows you to install a fresh, any version of the firmware. Unfortunately this file does not work with the new updates of today, but this bin file was from DJI and was called a service bin. Now i'm sure there is an updated service bin and i'm almost 100% certain that DJI uses this bin when they have to perform repairs to the drones people send in. The question is, who has this service bin file. If you try to downgrade using the app you'll notice that function has gone, it has gone because the new 1.5.7 has restrictions placed on the drone, restrictions that help DJI suck up to authorities like the FAA and restrictions to help with their turnover. Please whoever has this file share it, DJI's update has grounded a lot flyers.