Originally Posted by kocis_p
After installing the new rom will remain the data contacts, applications?
Data in your SD will be untouched. It is highly recommended that you perform fullwipe before installing new ROMS to avoid bugs and other issues. Actually, its a MUST for many scenarios.
You contacts will be restored if you enable google to sync your contacts. SMS will not be retained, however, u can download "SMS backup and restore" in Google Store, its free.
Apps however, will be gone. Unless you've backed them up(i'd recommend titanium backup). For paid apps, don't worry, u can simply download them again from google store.
HTC TYTNII -> HTC Diamond -> HTC Touch Pro -> HTC HD2 -> HTC Desire HD -> HTC One X
ROM = ICEDCold AOKP MS6 for HTC One X - Build 9