hey anti,
you are basically at a bootloader screen, what you have to do next is connect the phone through usb to ur computer/laptop and wait for it to recognize the phone and install its drivers, once the drivers are installed u will see that in place of serial, it will say "usb", at this point, go to
http://forum.xda-developers.com/showthread.php?t=1090505
and follow the instructions, there are 2 roms to download, and u have to follow the steps
1. download both files
2. open up the romupdateutility.exe from the first downloaded zip file and run it, follow the steps on screen, once it finishes flashing, it will show an error, ignore it and exit, ur fone will reboot and come back to the same tri color screen as before, then wait to see it say "usb" again, then you open the romupdateutility.exe from the second zip file that you downloaded and run the same procedure and wait
once u r done, ur phone will hopefully work, hope this helps.