On my Nokia X6 is a software version V30.0.003
On this website: http://www.nokia.com/gb-en/support/product/x6-00/
there is a new version of software V40.0.002
My X6 does not recognize the new software update (via Nokia Suite 3.7.22. neither over the phone).
Availability of update depends on Product Code / Region. Also, for Network locked devices, update is possible only after an approval from the Operator .. Hence, one of these may be the reason, you are NOT getting any ...