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This will all literally take less than 5 minutes. But i recommend upgrading to .205 firmware because it's confirmed towelroot works on.205 ( i used it on.205 too)
Go here and follow the guide and if you can't then ask for help on there as that is what they are there for
Many lags, app crashes, overheating...
See the official changelog by SONY for .205
I improves the User experience a lot, fixes flickering, sorts out the Bravia engine, improves file management and etc etc.
It is working well fr me ...at least.