How to install stock rom for sony tipo dual?

I tried installing jellybean through cyanogenmod 10 but now none of that supports tipo dual. The sim won't work in any of them.

I want to re install the old ICS 4.04 but no proper guide is available. I tried stuff given in this link but they didn't work.

In order to re-install the stock rom do I need to re-lock the bootloader, as it is not working with sony pc companion as well?

Source: http://android.stackexchange.com/questions/48641/how-to-install-stock-rom-for-sony-tipo-dual

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