2 - After Create flashable-signed.zip move to the memory of the Xperia ZL! (Watch has to be "signed" the file name if flashable.zip may have been an error sign for lack of java probably).
3 - Turn it off Turn and enter the Recovery
4 - In philz Recovery or TWRP Recovery Do it!
* Format Data
* Wipe Cache
* Wipe Dalvik
* Factory reset
5 - Last step Install ROM.zip you moved to the Memory.