Hello and welcome to Android Forums huuyy56
So, you have the Samsung Galaxy S4, i9502
, on China Unicom?
Originally Posted by huuyy56
I tried to boot my GT-i9502 this afternoon to get access to Google Play.
I think you mean, "root", and not boot.
HOWEVER, When I followed the instructions online (they are much of a muchness), I am stucked in the first step --- root with odin307.
There are currently 18 models of the Samsung Galaxy S4
and each uses its own rooting methods depending on the model and firmware. It might be helpful if you could post a link to the method you used to try and root your i9502
in case you have not used one that is compatible with your model of phone.