This is where "Official Unlock" tools fail. You cannot brute force an SE bootloader. You cannot downgrade the firmware to bypass it. The SE chip remembers.
Sony devices utilize a security check called the . If the bootloader detects a mismatch between the security version of the firmware and the bootloader state during the relock process, the device may fail to boot entirely, requiring professional hardware repair (EDL mode or JTAG). se bootloader unlocking relocking 1662 patched