
Originally Posted by
maderschramm
I would NOT recommend what CD95YJ stated.
ROM Manager is VERY unreliable on the DX. I recommend ALL ROMS be installed from clockworkmod recovery manually.
A "wipe" of the phone is accomplished through an .sbf flash. I have a tutorial on that in my signature, that will wipe out all but your sdcard, so if you have nand backups from clockworkmod or apps backed up with titanium they will stay.
Wiping data and cache is recommended for all ROM installations - sometimes it doesn't work, sometimes you brick, sometimes it does work.
Data is your apps, so back those up before wiping data, cache is fine to clear, it's just like a browser's cache. You won't lose anything pertinent