A flash file (often packaged as a .exe or a collection of .bin , .fls , or .xml files) is essentially a complete firmware image for the phone. Firmware is the low-level software that controls the phone’s hardware—managing the keypad, display, battery charging, and the basic user interface. The Nokia C201 runs on Nokia’s proprietary Series 40 operating system, and its flash file contains all the system code, drivers, bootloaders, and the user data partition structure.
Revives phones that won't start or are stuck on the Nokia logo. nokia c201 flash file