I found this really good tutorial, but its german ... I translate:
- prepare phone, go to settings > apps and disable "fastboot".
- shutdown phone, completely (if you want to be safe, remove battery and plug it in back)
- Boot into fastboot mode (press and hold VolDown + Power)
- plug usb to phone, windows will show up a new device. If the driver is not installed properly, install it via device manager (Download driver here). Now the device should show up as
Android Sooner Single ADB Interface
- Download this and navigate to
RecoveryClockmodByZaDkYn
and startInstalador.bat
- Now open a command prompt, press any button. Now the progress is started. If its finished, press any button again.
- Now you have ClockWorkMod installed, download this file, copy It to your sdcard. Boot into CWM, select
install zip from sdcard
and chosechose zip from sdcard
select su.zip and press power to flash it (you can navigate in the cwm with volumeDown and Up)