Download Xperia E3 twrp custom recovery
You can download Sony Xperia E3 custom recovery for installing variety of hacks and custom firmwares. However installing Xperia E3 TWRP is not as straight forward as Samsung phones.
* Download attached kernel – everything is included in this file.
* Reboot your device into boot loader
* flash it using flash tool or adb
* now boot your device
* while booting press volume up and down to boot recovery or else let it boot to boot system. 
That is it, you will now be able to install custom ROMs and perform all sorts of hacks on to your Sony Xperia E3 android phone. TWRP for Xperia E3 is similar to the CWM but adds ability to interact via touchscreen instead of buttons. So both provide similar functionality.