I do not like the Jelly Bean, flashee many times but all the phone version 4.1.2, 4.0.1. Try to find gingerbread but did not work nor rds lite or safetrap. I had a xperia pro with gingerbread and I turned out very good. So I wanted to maintain the same operating system but droid 4. Was to look like this and I guess you must have all the necessary software to operate all features of this phone. Besides one of the reasons is the compact keyboard that brought gingerbread, jelly bean or at least all versions Masserati down, bring compact keyboard and I find it difficult to write in este.No might believe that you can not go back to a basic system kernel , and then climb to the mismo.saludos