This is such a great device with a custom ROM (specifically StryFlex Marshmallow is a beast on this device) and I'm hoping I'll one day see it working with it again. Hope this helped you understand the situation better, and I'm also hoping there'll be someone that can help us in the future. This is, of course, definitely against what Sony would want us to do, and also not an answer that is a solution, but considering our warranties are over, the device has reached its end of support by Sony, and I've taken the device apart to be able to use its testpoint, I think this "hacky" method is still a theoretical solution.
#Xperia bootloader unlock Patch
I'd assume the same holds true today, or at least for the Xperia SP, and if we could get an Xperia SP TA backup with an unlockable/unlocked bootloader, we could patch this TA file to have our own unique Security Unit inside and possibly have a bootable device with an unlockable bootloader with fastboot back, even if the SIM-card reading is gone. Now I have done some research and found that 2011 Xperia devices had in their TAs a "Security Unit" section, which basically holds to-your-device-exclusive numbers that determine whether the TA is truly yours and whether the device boots. Literally changing the TA file and flashing it back won't work, the phone will be hard-bricked at that point and you'll need to use the testpoint found by taking the device's back apart, a hard-to-find tool to convert your TA backup into a SETool2-workable file and SETool2 to restore a backup of the TA you've made before doing any of the changes.
#Xperia bootloader unlock android
I've tried messing with my TA partition and all kinds of simlock.ta files, but I've figured out with a friend of mine with an SP aswell, the TA seems to have a value, a sort of hash it checks the simlock section of the TA, and if it doesn't match, it activates a lockdown, disabling the SIM-card reading ability, disabling fastboot completely (booting normally to Android when volup + power or adb reboot bootloader). Upon booting the phone up again, the bootloader was locked, and the service menu said "Bootloader unlock allowed: NO". I've had an unlockable/unlocked bootloader up until that point.
ftf file in Flashtool, thinking it would resolve my SIM-card reader issues. Not so long ago, I stupidly flashed the simlock.ta file included in an. I have some experience with the Xperia bootloader, having an Xperia SP myself and messing with it.
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