- run cmd as administrator
if garmin have letter G then add this in cmd and hit enter:

g: and hit enter

- nov add this in cmd:

attrib -h -r -s /s /d g:\*.*

and whait that procedure is over

p.s.

if your device have letter f then procedure look like this:

add in cmd:

f: and hit enter

add this:

attrib -h -r -s /s /d f:\*.*