Originally Posted by starterz
Just saw that M2 has been added to the official Sony website for bootloader unlock, but with the important note that it is possible only for handests using 18.3.C.0.37 firmware.
And I confirmed it worked like a charm using a model D2303. I indeed flashed the latest build noted 18.3.C.0.37 with PC Companion. Then I followed Sony instructions without hassles.
Beware Towelroot is unable to enforce the previous exploit. The kernel was patched accordingly. Furthermore I could not identify any suitable recovery yet.
Therefore it may be wise to wait a little bit prior to flashing this ROM...