I know the sim only works on the Apple devices (discovered after buying an android tablet - Doh!) I have used the sim a few times. Can anyone explain why the I1 needs to be powered up (with blades off - that bit is obvious), but why does it need to be powered up at all for the sim program to work? Surely the "magic" needed to have a controller talk to a tablet or phone should be enough for a sim scenario - or has this been changed in recent software upgrades? (away from my I1 for the last few weeks). Thanks for any feedback or suggestions to DJI if situation is still as I described.