New user here looking for some assistance. I paid for and downloaded the Garmin map update (City Navigator® North America NT 2015 Map Update for Kenwood ) and followed the instructions.
I first updated the head unit software to version 1.14.0
I then started the process to update the maps (via USB stick) and all seemed going well but at the end, a message appeared saying update failed - restart unit to complete update.
I restarted the update and noticed my map display was not as it should be. I tried to apply the update again and a message now pops up saying there's not enough space on the head unit to perform the update and to contact Kenwood.
Is there something I can do to free up the space required or do I need to visit a service center? I'm assuming the first update attempt used and locked up the required space.

Kenwood support pointed me to this site and this thread in particular but not sure if it applies to my situation - [Only registered and activated users can see links. ]
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Many thanks in advance for yor assistance.