Originally Posted by antmantucan
I get this error when trying to unlock my bootloader. I have c6903 and rooted it before moving up to 4.3. I then unlocked my bootloader on 4.3 (or I think I did). However, when I try to install supersu it says my phone is not rooted. However, when I try to unlock my bootloader I get the message "error phone is already rooted". I attached a screenshot below. Does this mean my phone bootloader is unlocked and my phone is properly rooted to then install a recovery? I want to ultimately install ihackers rom but want to be sure I have everything ready for a proper install.
I'm not sure why it says "rooted" in fastboot, but the commands you're sending are to unlock the bootloader, not root the phone. Your bootloader must already be unlocked, per the error you see. I hope you backed up your TA partition before BL unlocking.
Check out the Root on 4.3 dev discussion
for more details on a 4.3 root (which is only possible with an unlocked BL currently).