If you have been updating the Drivesmart 65 via Garmin Express you can find all the firmware listed here.
C:\ProgramData\GARMIN\CoreService\Downloads\PrimaryFirmware
They should look like this:Spoiler: In the folder you should see a list like this
Example of Drivesmart 61
PrimaryFirmware_PrimaryFirmware.006-B2588-00.6.60\software
DriveSmart61_660.gcd
As for downgrading I will leave that to one of the other members to explain how to do that.
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