I unlocked the bootloader of my p768 a while ago, and then I sent it to the carrier service, because it was having some signal problems.
I read that, once you unlock your bootloader, you can't lock it again, so, when I got it back, it was kind of restored and today I tried to flash Clockworkmod (.img file) and when I tried to reboot it, it said "Security Error", I followed this guide:
And when I connected the phone to the computer, and it says that the device already has the most recent version.
What do I do? Any suggestions?