I have a dorid razr original, great phone n i can do lots of stuff with it, but this recent upgrade i got about a week or two ago i don't like it, i don't like the internet browser tools, and i def don't like that now i can't use firefox as a hot spot but i could before with the previous upgrade which i believe was ice cream sandwhich like 4.0? so how to i downgrade back to that previous update