My device is aTomTom XL IQ Routes 2.
Navcore version is 9.510 perfectly working with map Italia_990_8306.
I tried several times to install and activate (using latest FastActivate) the Italia_1010_8891 map, without success.
Really, cannot spot where I make the mistake. By the way: when I launch FastActivate, it shows some strange behaviour: it seems some activity is carried on, but its windows is empty with no options displayed (as from the help text included). ...