For unlocked bootloaders only!!
Also this is ONLY RECOVERY for now! You cannot boot the actual system with it!
We will create a recovery for stock booting later! For now enjoy this.
2.) Flash it to phone with command:
fastboot flash boot recovery-nozomi.img
To boot again normal Rom you have to flash the stock Sony kernel.sin (can be found in ANY Rom ftf, just extract ftf as zipfile)
Reflash stock Rom:
fastboot flash boot kernel.sin
Have fun with it