Finally, this post was edited by xinyu39 1 on July 28th, 2009 13: 14. It is actually the bootloader of android, which is used to boot the system. In addition to loading android system, there are other functions, including recovery mode, Fastboot (brush system) and HBoot (? )。 Finally, SPL is used to read and write flash memory. In addition, SPL will check whether the data file to be brushed is correct. At present, most spl can allow us to brush the complete system rom, but we can't brush the recovery rom and boot image, because SPL will check the signature of the recovery and boot img. However, some experts (black and white) modified SPL and deleted the checking function, which is why engineering SPL is so important that you should brush SPL more carefully. Because once SPL is damaged, it is impossible to repair it without special equipment and technology. -So what is said in the forum is unclear about spl and non-spl. In fact, the brush spl that everyone said is a modified SPL. ! !