There is a basic XDF I believe. A brief search didn't find it but it's here somewhere

Yes, an XDF here on NM. Just implementing the checksum method detailed by setzi62.

So I was able to revive my ME7.5 ECU.  I don't really know for sure exactly what was wrong with the flash that I uploaded... (probably bad checksums).  I had a heck of a time trying to get the darn ECU into boot mode in either the car or on a bench.  I wasn't able to initiate a read of the ECU unless I left Pin #24 connected to ground the entire read.  If I pulled it off after 5 seconds of power, I'd get "BOOT MODE INACTIVE".  After a full read, if I viewed the resulting .bin file in a hex editor, it was utter nonsense.  It looked nothing like a legit file.  The entire file was random bits and there were no maps to be found.  It didn't resemble the file I had flashed at all.  I have a feeling leaving pin #24 connected during a read corrupts the output.

When performing a write of a "good" file to the ECU, I was able to get it into boot mode by disconnecting Pin #24 from ground right before the Galletto software initiated the Write sequence.

In any case, I was able to write my original GIAC file back once I figured out boot mode.  There appears to be no problem with the EEPROM contents.  The car started right up.   Strangely I did not have to reflash the file with Nefmoto again to clear any code.  I was told there would be a code that could only be cleared by the Nefmoto flasher after writing with Galletto, but I see no evidence of this in my case.

Thanks again everyone for the help.

Oh but I did.  I tried everything.  The only time the Galletto software didn't tell me that boot mode was inactive was when I left the pin connected to ground while the ECU powered up, and throughout the read.  If I disconnected it before I initiated the read - nothing.  It took me 2 days of trial and error to discover this.

But that makes sense why the resulting .bin after a Galletto read was garbled nonsense, because one of the pins was probably always outputting 0's. ha.