We've developed our product for the electrical domain, in our produced we've used LPC2468 microcontroller with ARM7 architecture. In our product we are using Keil RTX operating system and its flash file system. We are having the 4MB external NOR flash memory, in that flash file system has ported for store the files. In our source code, we are not able to see the source code of flash file system, it is in the form of library it seems. Recently we are facing issue that, microcontroller rebooting during the flash file system, when source invoke the finit() API system is getting reboot. We are not able to fix this issue because it is in the form of library, so please let us know how to fix this issue? and what would be the reason for reboot during the flash file system?.