Flash this MOD via CWM, no need to wipe anything http://d-h.st/8mk
For those who SWAP their storage but would like to go back to factory default.
Flash this MOD via CWM, no need to wipe anything http://d-h.st/VE4
Tested on Xperia go ST27i running JB 4.1.2 (6.2.A.1.100 firmware), for those who tested this MOD on older firmwares or other identical device,
please post message and I will update info.