I have a general curiosity question. If the bootloader on a phone, such as a Galaxy S or S4, is not functioning properly, and the JTAG port nonfunctional, is there any other way to reprogram the bootloader, such as through a serial port? If not, can the chip be de-soldered and replaced? Is it a single chip that contains the CPU and the flash that contains the bootloader and android operating system, or are these on separate chips in general? Thanks.