Lumens Technology CT-S50 - Manual (Page 18)

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 At this time, iTunes on laptop will be activated automatically, if not, please
double click iTunes to activate.
 Select one iPad in the [Device list] on the left side of the screen.
[Note] When using iTunes to update manually or automatically, please ensure
the battery of the iPad is more than 50%, to avoid the interruption of
operation due to insufficient power caused by too large update files or
lengthy update.
 Click the [Update], and proceed to the next step following the instructions
on the screen.
 When one unit is completed, proceed with the update for the next iPad till
all updates are completed. The duration of update differs depending on
the size of iOS files.