I've just upgraded my FW from K800 to K810 using the R8BA024 RED52 files. I am able to make and recieve calls but unable to download settings for SMS/Internet/MMS. I have tried using search but nothing relevant seemed to display

Any help would be gratefully recieved.

what net work

Look in support on sonyericsson.com for settings.

What phone operator/network and region are you on? If you uploaded the preloaded_config.xml included in your custpack it should have asked you if you wanted it to set it up for you. The settings for most operators in that region are included in it. Otherwise it should be easily available from you operators site.