E40 Corvette operating system file support
Per the GM TIS web site, that VIN should have one of the two following operating systems:
VIN:1G1YY24U955100573
Controller:PCM/VCM
Powertrain/Vehicle Control Module Calibration History for: Main Operating System
Part Number
Both of those operating systems are supported by the current EFILive software.
I am not sure why your vehicle is showing 12595751 as an operating system. Are you sure you are looking at the correct file tab because that part number is the speedometer calibration file part number for your vehicle. Are you using the latest EFILive software that supports E40?
If you are still having these issues I would get your vehicle flashed by a dealer to the latest stock calibration files and that should give you the correct operating system (or you can do it yourself if you have the software/hardware to do so).
If you had a stock EFILive calibration with ALL the correct files for that vehicle, you could also use EFILive to update the vehicle.
BTW - anyone can check what the correct files are for a specific VIN GM vehicle by going to:
http://tis2web.service.gm.com/tis2web
Jason