Installing Android 4.1 or higher on Sony Tipo with permanently locked bootloader My operator (Telecom HU) has disabled unlocking the bootloader of my Sony Tipo. I would like to get Android 4.1 or higher on my device, but so far this seems impossible. I successfully installed ParadoxRom, but I found out that it is just a re-skin of the same android version I had before. My choice would be installing Cyanogenmod 10, but every tutorial I've seen so far relies on unlocking the bootloader, and as I found out from the service menu, this is impossible in my case.



If this doesn't prevent me from upgrading to 4.1 or higher, I would like to know what rom(s) can I use that are actually a newer operating system rather than a heavily edited ICS.
Have you tried FlashTool?

This is a particular software suite for flashing ROMs on Sony handsets, however, I am not 100% confident if it supports the Tipo.

The full forum thread that discusses about this tool can be found at XDA so it might be worth a try to read the thread from beginning to end, to see if others have used it successfully on the Tipo. 

If no luck, try posting a question there on that XDA thread, identical to the above question that is asked and wait for a while for someone to answer - you do need to be patient, as people are answering in their own personal free time.

Be warned though, using this tool, you could lose data, as a result of unlocking the boot-loader, there is a FTF (Flash Tool Firmware) file available for listed and detected devices, which can circumvent this and also can re-instate the boot-loader lock mechanism.