I tried this, but it did not work.
I have tried turning off Sprint Optimizer, as well, changed profiles in the other
modes, and still not working. I will be in a 4G area in an hour and will see what's up there.
Wonder if this is why I did not receive the Sprint notification that the update was available?
UPDATE: I am in a 4G area and it appears to be working fine on the LTE network. I don't know if I will be able to do the unbrick method and try the manual ICS update again until next week, but for now, I will have to get accustomed to switching back and forth between those settings, if I need 3G connectivity.