DJI Go 4 on my iPhone reported that a firmware update was required for my Spark, along wi5h a new flight zones database.  The latter downloaded and installed OK.  The firmware update got to 99% and hung.  The forward LEDS on the drone were steady green and the rear LEDS were flashing yellow.  I let Spark sit there, hop8ng that thenupdate would complete until it’s battery went flat.  Any ideas on why th8s would happen and how to correct the problem?  Tbanks.

Happened to me once. I tried again, and it worked.
If still no luck, I would do it with dji assistant 2 instead.

Hi there, we're so sorry for the inconvenience. The database issue has been aware and fixed at this moment. Please try to refresh and check again.

DJI Susan Posted at 2018-1-30 00:22
Hi there, we're so sorry for the inconvenience. The database issue has been aware and fixed at this moment. Please try to refresh and check again.

Whatever was done fixed my issue.  Thabks