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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.

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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.

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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.

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  • I've not used FlashTool before, and I don't quite understand how it's supposed to unlock the bootloader.
    – SeinopSys
    Oct 8, 2013 at 21:05
  • As I have stated in the answer, Flashtool is specifically to Sony handsets, those FTF files were floating around and put together as a compilation to aid in unlocking device by clicking on a blue icon representing a thunder or a spark to unlock. That is to the best of my knowledge, I have used it on Xperia Mini, unlocked bootloader, discovered upgrade to ICS was impossible because of bootloader state, had to lock it, then ICS upgrade happened, after that, I had to unlock it again to put LegacyXperia ROM on it and have not looked back since.
    – t0mm13b
    Oct 9, 2013 at 10:27
  • They key problem here is that I cannot unlock my bootloader and thus I'm unable to flash any sort of advanced firmware. You keep telling me I need some "FTF" files, but you never pointed me towards any directly, and I still have no idea if I will be able to unlock the bootloader or not.
    – SeinopSys
    Oct 9, 2013 at 14:59
  • All the FTF are contained in the FlashTool distribution which weighs in over 100Mb in size.
    – t0mm13b
    Oct 9, 2013 at 15:23

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