I don't get it... have my company's P4 so I can upgrade the firmware... spent HOURS over 3 days trying to get it to work... used both the GO app and DJI Assistant, multiple devices, multiple computers, multiple cables, multiple SD cards and kept getting all sorts of error messages and not being able to download past 0%... finally said "f it" and went to just fly it around (still flew fine on old firmware)... started the motors and the red upgrade prompt showed up on the GO app equipment screen... I couldn't believe it... I clicked and it uploaded quickly... I don't believe it... all set and working great... but I still prefer just putting the bin file on the SD card!!!