Can I change the language of my camera from Japanese to English?

This is EXACTLY to correct answer! Thank you very much for taking the time to reply to this and post this answer.

My wife bought this $750 camera in Tokyo and assumed we would be able to switch it to English when she got home. I could not find the English language setting in the menu. She did a search of Japanese websites and they all stated this was a Japanese only version of this camera; it was not the international version. She was very sad to read this.

This application worked perfectly! First click the tweak tab, second, click the Disable Protection check box at the bottom, third click Enable All Languages check box. Done.

Changing to other languages is now enabled in the camera menu. In the camera you still need to be able to read enough Japanese to find the change language to English setting.

Very useful, used on my Sony WX350, japanese language only. Small comment: charge the battery first :-). In order to enable all languages, first has to be enabled 5th box (software unlock, I think).

The answer posted by Badger on 27 July is exactly the correct answer.

This works with dsc-rx100 model?

@joao_vitorio i just tried on my dsc-rx100 model, and it works!