No. The 1200 uses firmware RH-99. Flashing RH-105 onto RH-99 will result in a non-functional keypad matrix.
The S30 firmware loaded onto the RH-105 is a masterclass in resource efficiency. Unlike modern smartphones that require gigabytes of RAM, the Nokia 1208 operated on a few kilobytes. Nokia 1208 Rh 105 Flash File
Key Features Driven by the Firmware:
This is the most frequent issue. You try to turn the phone on, and it does nothing. Or, it lights up briefly and then shuts off. This usually happens if the firmware gets corrupted during a bad update or a battery pull at the wrong time. Flashing the firmware reinstates the operating system. The S30 firmware loaded onto the RH-105 is
The device shows the “Nokia” handshake logo, then restarts repeatedly. This indicates corrupt system files in the MCU area. You try to turn the phone on, and it does nothing
Sometimes, a software glitch causes the phone to reject all SIM cards, even functional ones. Re-flashing the original firmware can reset the SIM interface drivers.