Have you addressed the fact you had zero connectivity problem's prior to updating to 4.1.2...
The tiny R above network bar's is for roaming... that's as it should on 48.
Advice:
Search the net for data issue's after updating firmware 4.1.2...
I'm leaning to a data traffic query subject to the above, & if so, you do not have to re-install Internet Setting's.
If it turn's out to be the case - Your choice's are limited, but have a poke on the net as mentioned to consider what next.