It will only work if Sony uses that same method to generate the SBK. You can test it in APX mode with "nvflash --bl bootloader.img --sbk 0x0C8D6F00 0x0433F601 0x6B5C1203 0xD9292103 --sync". If it works, it will spit out a bunch of chip data. If not, you will get a write error.