LT18a - Upgrade Options - Bootloader locked
I own an LT18a which appears to be an LT18i equivalent? It's an Xperia Arc S, Central American GSM version.
It is SIM unlocked however it's made after 12W11 so I cannot unlock the bootloader. In the root status it says Bootloader Unlock is not allowed.
It is trapped on Android 2.3.4 which is horrible. No OTA available.
I am wondering what my options are, I have searched but seem to hit dead ends. Is there any alternate way to unlock the bootloader, I tried a few paid services but they said after 12W11 there is no support.
Can I install leaked 4.1 official firmwares like the UK one posted here via flash tool or can I not install anything except what is OTA (nothing at the moment).
Thanks in Advance