Default Reinstalling stock ROMo

Proud xperia S owner here.
My mom got the old x10 of my brother, who did a lot of flashing on it. It has custom Rom now. Her battery is bad so I want to reflash her stock rom.

Question: what is the most recent rom for x10 and where can I download it? Can I just flash it with flashtool? Anything I need to know? It has locked BL

Thnx in advance

Pannekoek28

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My phone specs:
Sony Xperia Z1 Compact
Android 4.4.4 Kitkat
Stock ROM 14.4.A.0.108
Root access: yes
Bootloader: locked, but unlockable