Yes , absolutely sure: I was surprised too after reading all this posts...
Never before used nld, dumpldore or such stuff.
I was able to downgrade with iOS DJI 4 app to 300 from 510 and then used nld activation key to boost the m2 first time.
Only one point: 1st attempt to downgrade from 510 to 300 finished without showing 300 in settings. I tried a second shot (this tooks more time) but it worked finally.
Actually I’m back on 400 - even by the go app. After upgrade 300->400 the boost was gone, so I reinstalled the boost hack and it worked.
So, still confused if i see so many posts regarding not downgradable...[quoteI
I was trying to downgrade for NFZ removal but even though it can be downgraded to 300, I can't upgrade to an antirollback 400 then go down to 200 or 100. The Mavic knows the different versions and won't install a antirollback firmware, oh well, its still fun to fly even with restrictions. Just hope someone can hack it at some point. Height restriction is mainly what I want but no version fixed that so far.
Yeah, that's the same thing I have done. I started with .510 and downgraded with DJI assistant to .300. I was able to boost FCC but I honestly haven't noticed a difference. I have only gotten to try it once lately though due to weather.
I have tried the Dumldore route, and can't get it to downgrade at all. Does anyone have info on how to get this to work, or is like NLD and unable to rollback to old Versions also?