[Q] Can't unlock bootloader, Software says I can
So I've been having a problem with my Z Ultra that I haven't been able to solve for a number of weeks now.
The service menu on my C6833 specifically says that the bootloader is unlockable, as shown here:
(imgur) com/OO9549 (sorry, XDA won't let me post links yet. ><)
However, when I try unlocking using Sony's official instructions (and using FlashTool) - I get the following:
fastboot -i 0x0ffce oem unlock 0x(my key here)
FAILED (remote: Command did not succeed)
finished. total time: 0.027s
I've copied/pasted the key, I've typed it out manually, they all get me the same error. I'm running Windows 8.1 (finally managed to get the drivers installed), yet this also happened on a Windows 7 machine. I've been racking my brain, but I can't find ANYTHING that'll help. The last time I tried, I gave up trying to unlock the bootloader and installed the DualRecovery for locked bootloaders, which ended up bricking my phone and I had to flash back to stock.
Help! I just want to be able to install custom roms again! D: