Im trying to operate camera with my 2nd controller for a friend that has not updated since 2.0.15  - He does not want to upgrade until we finish a job. Unfortunately my newly upgraded RC firm does not communicate with his i1 and it makes my Galaxy TAB 4 crash to the point where it is un-usable. Can I get older firmware for my RC and old APP for my tablet? Does someone out there know if it is possible for me to downgrade to 2.0.15 for the upcoming job? Thank you all for your help!

You can NOT downgrade.

Not even on the controller and DJI App?  ... Dangit!

Sounds like the new firmware is a downgrade. So disappointed am I with the comments of the resultant firmware that I haven't installed it yet. As such I haven't flown but once since the new firmware was announced. Alas I too will be forced to install the latest botched firmware before my Inspire is locked out.