Very odd. I wonder if some models have different hardware/GPS chipsets (MTK)?
The current download for my nuvi 1250 is only up to v4.80.
Checked again today.
Note difference to the common 5.10 here:
"nuvi 12xx ([GCD File) software version 5.10" dated February 28, 2011
and mine (AUS/NZ model):
"nuvi 12xx (GCD File - MTK) software version 4.80" dated March 7, 2011
_http://www8.garmin.com/support/download_details.jsp?id=4549

Oh well too bad for me.:angry: