Hey doods!
First time posting to this forum. Thanx for having me. I know this information is probably old, but here goes anyway...
According to the published firmware release notes, update v1.09 simply updated and expanded the NFZ database. This raised a flag, because my partner was out on a job, and his Inspire wouldn't launch within 1.5 miles of the airport (had COA, 333, NOTAM, etc. for the flight). Hmmm... Because of this, I decided I would research the firmware updates to see when NFZ "feature" was implemented. Turns out the firmware release notes don't share that information, and the DJI chat "technicians" haven't a clue, either.
Also, turns out that DJI doesn't have many of the firmware versions .bin files available as stand-alone files on their website. But, instead (according to the log files), roll v1.06 into the v1.08 update, and roll v1.06 and v1.08 into the v1.09 update. I suspect the NFZ "feature" was rolled into v1.08. But because v1.08 has many other important updates (like addressing an inaccurate battery warning issue), I decided not to push too hard for v1.06. My objective was to NOT have to deal with NFZ's (one of my clients was right next to an airport). So, instead of updating my new bird to v1.09, I updated to v1.08 (from v1.04 out of the box), and she's been flying great.
Note: Though I was able to start the motors near our International Airport, once I connected the iPad (and therefore the DJI Go app), I was no longer able to start the motors, but instead faced the dreaded "NFZ" warning. Interesting. So there may be a hack to get around the NFZ's completely. Because I don't ever fly near our International Airport, I don't really care too much about the present NFZ coverage area. Maybe someday I'll seek out a hack around this, but I digress...
After a half dozen successful flights on v1.08, for grins, I updated her to 1.09. Turns out my GF's house is 4 miles from a small, private airport. Therefore v1.09 flashed a warning up on the screen (with 2 check boxes and an "agree" button) that I was in a "warning zone." In order to fly the bird, I had to agree that I understood this. This doesn't just pop up once, but every time one flies. Forget that. Hello v1.08. Without a single flight, I rolled her back to v1.08.
As far as I can tell, update 1.08 addressed all battery, motor, ESC, IMU, PMU, FC, GPS issues - and a few other issues. So I'm good with v1.08. v1.09 just expands the NFZ database (says so right there in the release notes). Forget that.
I'm of the school, "If it ain't broke, don't fix it." So I plan on staying with v1.08 for the life of the bird. The caveat is a "firmware update required" warning pops up every time I open the DJI app. Closing this warning is a single click.
Fly effectively! (Mike Rowism)
Donnie Frank