Good ; I have already taken the test
I tried to update my firmware 4.2 eTrex 30 with the new eTrex 30X .
I renamed the picture to GUPDATE.gcd and introduced into the folder Garmin GPS .
I started ..... and nothing, not updated.
For me it would have to modify some other setting , the device may not know.
Therefore test performed without success.
regards