k608i - How can I restore the firmware?

[starjet905]

When I gave my 3 UK branded k608i to a local phone shop to get it unlocked so I can change SIMs whenever I wanted, they put the k600i firmware on it. Since then, phone status reads "Model:k600i".
But I later learned that the k608i too has an unbranded firmware. And I've been trying to install flash drivers (for XS++) for my phone.
As you must know, this phone comes with a weird USB connector that I've never seen on any other SE phone. So maybe the remove SIM, hold C btn thingy doesn't work on this.
If so how can I put the proper k608i firmware on this?
Thanks in advance to a person kind enough to help me out. :)

[ts013]

You need a T28 cable or a sync station to flash your phone.

[Taurus3]

u can down load at top sony and reflash your phone.

if u have phone model in hand, know your cid of your phone and download in top sony. Down load xs++ and read tutorials on flashing in top sony before flashing, top sony is not responsible damage caused to your phone for your acts.

[JoMacHo]

XS++ as soon as it connects it logs your phone info.

[dattebayo]

You will probably need your original gdfs info too

[GinnCorvus]

You need a T28 cable or a sync station to flash your phone.

The USB cable included function too!! Instal flash driver, plug cable to usb pc port, select usb port and, for detecting, hold "C" and press ON/OFF button.

But I later learned that the k608i too has an unbranded firmware. If so how can I put the proper k608i firmware on this?

The k608i firmware is FS and CP language limitated, not for all user.