A flash file (also called firmware, stock ROM, or flash image) is the low-level software package that contains the phone’s operating system, bootloader, hardware drivers, and user interface. For the TA-1203, this file typically includes:

Flashing your Nokia TA-1203 can restore the device to its factory state, effectively removing forgotten security passwords or fixing software glitches. However, be aware that this process erases all data on the device. 1. Purpose of Flashing Remove Lock Codes

Power off the phone and remove the battery for a few seconds, then reinsert it.