Dave, your right, I shouldn't have said certified. DJI is producing an EU Declaration of Conformity and has been for over a year (based on sign dates).
UAV/Drones etc are in a very grey area right now the FAA and the world are dealing with very cautiously. I have been flying full-scale jets and other aircraft, dealing with the FAA for over 20 years. Unknown and untested modifications of any type are not taken lightly. When safety protocols are intentionally bypassed, they will come down severely on a commercial operator that should have known better. When something goes wrong, they will look at every angle and try to blame the pilot, even for software or hardware malfunctions.
Again, the FAA tells us what we are ALLOWED to do. We are allowed to fly between sunrise and sunset, there is a waiver that allows us to fly at night. We must maintain VLOS, there is a waiver that allows us not to. For my Part 135 company, we have a full list of SOPs and OpSpecs that tell us what we are ALLOWED to do. The FAA does this for a reason. If you can't find where you are ALLOWED to do something, you can't do it. Unfortunately, all CFR 14 regs, Part 135 and 107 included, are written for lawyers by lawyers.
Maybe, as of now, we can get away with such things... Maybe? It is not written where it says we can. Currently, I think everyone is obsessed with tracking and disabling runaway aircraft. But allowing software modifications would lead to transponder 'clones' and other issues in the future.
Go watch the movie 'Miracle on the Hudson.' I normally don't recommend movies, nevermind aviation based, but they did nothing wrong while making all the correct not to mention difficult decisions. And the FAA wanted nothing more than to make examples of them. It is a scary world honestly. All the experience in the world and you will be treated as a student pilot in the end.