DJI Lightbridge User Manual - Manual (Page 39)

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Notes
(1) Connect to ground system for ground system main controller and ground system decoder upgrade,
and connect to air system for air system main controller and air system encoder upgrade,
(2) Internet connection is required for LIGHTBRIDGE firmware upgrade.
(3) DO NOT power off until upgrade is finished.
(4) If firmware upgrade fails, main controller will enter a waiting for firmware upgrade status automatically.
Repeat the above.