Sony official bootloader unlock procedure below...
Official things always are supposed to work better
Official link
Unlocking the boot loader | Sony Xperia
Supported models list:
Sony Ericsson Xperia™ PLAY
Sony Ericsson Xperia™ arc
Sony Ericsson Xperia™ arc S
Sony Ericsson Xperia™ neo
Sony Ericsson Xperia™ neo V
Sony Ericsson Xperia™ pro
Sony Ericsson Xperia™ mini
Sony Ericsson Xperia™ mini pro
Sony Ericsson Xperia™ ray
Sony Ericsson Xperia™ active
Sony Ericsson Live with Walkman™
Sony Xperia™ S
Sony Xperia™ P
Sony Xperia™ go
Sony Xperia™ U
Sony Xperia™ sola
Sony Xperia™ acro S
Sony Xperia™ ion
Sony Xperia™ miro
Sony Xperia™ tipo
Sony Xperia™ tipo dual
Sony Xperia™ V
Sony Xperia™ J
Sony Xperia™ T
Sony Xperia™ TX
Sony Xperia™ E
Sony Xperia™ E dual
Sony Xperia™ ZL
Sony Xperia™ Z
Sony Xperia™ L
Sony Xperia™ SP
Sony Xperia™ Tablet Z
Sony Xperia™ M
Sony Xperia™ ZR
Sony Xperia™ Z1 Compact
Sony Xperia™ Z1*
Sony Xperia™ Z Ultra