upgrading android from 4.2.1 to 4.2.2

[bhen]

after i upgrade my android o.s from 4.2.1 to 4.2.2.i expect more but why it becomes slow?,,my drop box is not working,,signal is very slow,,my phone galaxy grand dous. pls help and improve your work.

 

[Phillip Corcoran]

Try factory resetting your phone. You'll find instructions on the manufacturer's website, in the support section.