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App2sd is not required for this process.when you will update the phone via pcc it will flash the stock 4.1.2 firmware and in place of that new JB 4.3 will be installed so need not to worry about memory.
with dual I don't know how much, with the m there's a little more free ram and no apps2sd
this function is available according to the phone makers.Sony has decided not to provide this function in our phones.But normally JB 4.3 supports app2sd function.