Here is a screen shot of the firmware you need.
Spoiler: See screen shot on firmware
You need to have Garmin Express installed and have been using it and updating your Garmin Drivesmart 61.
or
You will need what Garman_Nuvi has posted in the post above.
But you should be using Garmin Express for all your updates....
Spoiler: For windows Garmin Express:
Spoiler: For mac Garmin Expresss:
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