Is it still possible? My girl got me a DJI Spark for Christmas and it came with the latest firmwire - 01.00.1000. After finding videos of the attitude record being broken, I bought the NLD mod and decided to go for it. Upon my first attempt of downgrading with the NLD client to 01.00.0300 - it said "downgrade failed" after 80% install was complete with no explanation as to why. I tried to downgrade to a different version - 01.00.0600 with the DJI Assistant 2 app and that worked. Next I went back to the NLD client and tried downgrading again to 01.00.0300 and now it's hung up on 20%. Any suggestions? All the youtube videos are saying it should work fine. Thanks.