I have been unable to flash firmware to my Samsung Galaxy S4 (i9505G) after unlocking the bootloader, the unlock causing a very complicated (and unknown) mess-up to my system. I honestly don't know how it happened as I followed a guide step by step. Every time I boot into Download Mode and try to flash the firmware, Odin fails when trying to write and my phone always says WRITE PROTECTION: Enable in the corner of the screen. How do I disable write protection?