2002 OS 12212156 .xdf

[babywag]

There are 8 segments of code in the PCM, and 8 related Checksums that must be calculated. The 7 calibration segments have straight forward Checksum calculations. The Operating System (OS) uses a unique Checksum calculation. It sums the entire areas before, and after, the 7 calibration segments (it skips over these), and also excludes the last 16 bit placeholder at the very end. The native Tunerpro Checksum plug-in can't properly calculate the OS Checksum. There is an LS1 Checksum plug-in available for Tunerpro on the Delcohacking website that will calculate the OS Checksum, but it will only work with 512 Kb PCMs, and is accurate for most (but not all) operating systems. Attached below is a link. https://pcmhacking.net/forums/viewtopic.php?f=3&t=3845

Dimented's .xdf did correctly calculate (fix) the bad checksum for system section, even though it isn't correct for 12212156 os.
I don't have the plugin installed. I did not look @ the .xdf difference on how the checksum is calculated.

I played around some more and also got an incorrect checksum when trying to change some transmission items.
Right now as it is the .xdf(s) will likely brick the pcm if it is used.