You want to flash the TSOP on the 1.4?
In that case, get hold of an exploitable game and a memory card. Solder the TSOP points on the 1.4. FTP one of the Raincoat gamesaves to the chipped Xbox, copy it to the memory card, then onto the 1.4 Xbox. Run the game, load the gamesave, follow the instructions to flash the TSOP.
Alternatively, instead of using a Raincoat gamesave use a Krayzie 1.1.1 softmod gamesave. Softmod the Xbox, install Evox dash as an application, then use that to flash the TSOP.