(adsbygoogle = window.adsbygoogle || []).push({}); What is the purpose of using the 4.11 DEX opposed to a 3.55 cfw?

DEX is a dev firmware and 3.55 CFW is for what ever you choose to do.

DEX can play games encrypted with higher keys :
411DEX can launch games that requires 411FW
420DEX can laucnh games that requires 420FW

on 411DEX & 420DEX, no more backup managers, u'll have to use the HDD boot for games.
check google