The Tita100 is your device, the 6800 is also known as the titan among other names. If it is in 4 color screen you can flash a rom onto it by connecting it to the computer(the serial should then say usb), if it has a three color screen, you need to stick the stylus in the reset whole on the bottom, and hold down the camera buttons and power button, all at the same time and that will give you the four color screen, and you can then flash your phone to ypur rom of choice, but the 6800 is not a phone originally made for metropcs, here is the link you need to go to.
http://forum.ppcgeeks.com/forumdisplay.php?f=57