Yea, firmware 40.2.005 is available for the RM-428 NAM 5800 Navi edition now (product code 0591814), but not yet for the RM-428 NAM XpressMusic (product code 0577454).
If you want it for your XpressMusic now, just use NSS or JAF to change your product code to the Navi version and then use NSU to update. You could try FOTA, but when I checked a few days ago there were no FOTA updates for either of the NAM product codes (or the alternate NAM codes).
PC Suite still works for me, but Ovi Suite has been graduated (it was a beta product originally), so you may want to give that a try if PC Suite doesn't seem to be working for you. Note that there was an update to NSU very recently, so you will probably need to get the latest version of that as well.
If you want it for your XpressMusic now, just use NSS or JAF to change your product code to the Navi version and then use NSU to update. You could try FOTA, but when I checked a few days ago there were no FOTA updates for either of the NAM product codes (or the alternate NAM codes).
PC Suite still works for me, but Ovi Suite has been graduated (it was a beta product originally), so you may want to give that a try if PC Suite doesn't seem to be working for you. Note that there was an update to NSU very recently, so you will probably need to get the latest version of that as well.