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Frequently Asked Questions

  • VERSIONS: The release notes published by DJI talk about features. What about problems? This is a community contributed set of release notes that will be progressively updated to share known issues.
  • DATALEAKAGE: This page will contain documented examples of data leakage related to the use of the DJI ecosystem.
  • LINKS: Where can I read more about this whole mod and hack community?
  • TRUST: You are hacking DJI firmware. Can I trust you?
  • LOGFILES: Where to find log files in DJI gear.

New Questions

If you have a question, post it below. We'll add an answer in if we think its a good question.

Q1: Reverse Engineering of OcuSync Protocol: I am wondering if anyone has tried to reverse engineer the OcuSync protocol yet or if there are plans to do so? I believe this could be a very promising thing to do. It would enable to use of custom viewing devices such as any HDMI screen or FPV goggle (instead of the rather pricey/bulky DJI Goggles - Also DJI Goggles have several issues for people wearing glasses. There is no focus adjustment and some people simply can not use them). Thinking further it would also allow for custom controllers: e.g. It is just a rip-off that the Mavic & Spark Controllers are not interoperable even though they are both based on OcuSync. DJI did it on purpose to earn more money in selling more Combo-packages. Once the OcuSync has been broken it should be possible to port the code to a Raspberry Pi which would make for a perfect Ground Station or Viewing device (more than enough computation power and HDMI out). Just my 2ct, Cheers! Keep up the excellent work!

Answer: I had heard of some work in this area, but it is unpublished at this time. Keep an eye on the various GIT repo's for the OG team. Thats where you will find anything officially published.

Q1.1: Reverse Engineering of OcuSync Protocol: Thank you very much for your answer. Can you give a hint who the “OG team” is? I did some Google/GIT research but I am not sure about the results ;-) THX!

A1.1: Click “About” on this website. OG = “Original Gangsters”.

Q2: Bricked P2s which DJI caused with known broken firmware and refuse to fix: Are you aware of the horrible situation for huge amounts of Phantom2 pilots when DJI released a firmware which turned off their wifi and video and battery voltages readout - rendering the drone almost like a pathetic broken toy. There is a class action lawsuit to get DJI to fix this stuff. They are saying you have to pay $200 to get it fixed when it was their hokey firmware that ruined things. Who knows how the court case will come out but maybe some experts like you guys could do a firmware fix to take them back to a stable firmware perhaps with a dumldore type tool. The tens of thousands of people who cant fly now would love you and may also donate for helping them. Would you like to look at this.. or do you know much about this already. Respect for all your work… Dumldore rocks. from

Q3: Disabeling VPS (aka Vision Positioning System) on DJI Spark : Recently we discovered that the VPS System of Spark (consisting of Optical Flow Camera and IR-Sensor Unit on the bottom of the device) has problems on certain surfaces or when flying over certain terrain. Whereas the VPS feature can be deactivated on P4 and Mavic DJI has decided to hide the VPS enable/disable dialog in DJI Go4 for its entry level drone. Is there any way to deactivate VPS without covering/taping the sensors? Taping the sensors results in copter constantly gaining height and acting unexpectedly. Thank you very much! Keep up the excellent work!

faq/start.txt · Last modified: 2017/11/08 12:47 by husta