Okay if you need a 1024k (1mg) BIOS heres how you go about doing it.
Find and download a program called X-Ecuter 2.0 Bios Manger. Witch can be found
here.
Now run X-Ecuter 2.0 Bios Manger and click the "import" button. A new window will open up, select the BIOS that you want to flash yout TSOP with. Continue to import the SAME BIOS to the other banks until they're all loaded with the same BIOS
Now click the save button, and save the bios bin as "bios.bin" or what ever you want to save it as. And I would suggest saving it in lower-case b/c it may not work in uper-case.
And now you have your 1024k (1mg) BIOS file you need.
As for the 1.2 vs 1.3 boards they are 100% the same, so the jump points should be the same.