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Video guide - How to root Xperia 2012
Video by marasand and steveboss
Copy your kernels for rooting into /flashtool/firmware/ folder
Flash your .10 kernel
Connect device in flash mode
Unplug USB cable and start device
Go to Settings ---> Security ---> enable Unknown sources
Go to Develper options ---> USB debugging and enable it
Connect USB cable into device
Do NOT unplug the USB cable!!! It takes a while and some reboots..
Now you can disconnect USB cable
Turn your phone off
Flash your .54 kernel
Connect device in flash mode
CWM recovery installation
Connect phone with USB debugging ON
Disconnect USB cable and turn device off
Push the volume down button several times... Only check if CWM is really there :)
Thank you :) Video made by marasand and steveboss Translated by marasand