99 Sierra 5.3/4l60 XDF or update to 2156?

[cgw]

Have a 99 Sierra 5.3/60e that has the 3372 operating system on it and have not been able to find an XDF for that OS, does anyone have one? Failing that, what do I need to do to be able to update the OS to one of the 2156 5.3/60e OS's?

[ralmo94]

To update you just have to flash a compatible bin that matches your vehicle. Mostly transmission segment, and engine size.
Have you tried universal patcher? It should be able to read your bin. And generate an XDF.