i have one us garmin astro 320 with 6.80 software vesion.
I want downgrade to 3.40 software version with webupdater
when the process begins an error comes to my monitor which says "the updater file have errors" and the process stops there.
I know that there isn't 6.80 version for astro 3.20 and i also know that it have turned the .xml file
is there any where to get over this problem and put any version astro can wear?