I found this today as I was making some adjustments. Not sure if anyone else has already posted this, so I will.

If you set up tunerpro software with me7sum and me7check as custom tools, it is important to use the checksum tools in the correct sequence to avoid unwanted checksum errors to your finished file.

1. modify your file
2. save the modifications in the parameter windows
3. SAVE THE BIN FILE. This must be done before you proceed.
4. run me7sum to correct checksums
5. run me7check to verify the file.

If you were to hit the "save" button or file-save or Ctrl + S after correcting the checksums, you will cause errors to the file which can be detected by me7check. This is true even if you have made NO modifications to the tables etc.

The moral of the story is to ALWAYS run me7check immediately before flashing to verify the file. I (knock on wood) haven't bricked my ecu because I'm very careful when flashing my car. The save button error is likely the reason I accidentally uploaded a dodgy checksum error bin file, and ruined another users night.

Stay thirsty my friends.

I already own the mtx plugin. However mtx leaves some errors that me7sum does not eg rsa signature error, so I only use me7sum now.

My post was not to talk about methods of correcting checksums. I wanted to warn people that errors will be created by simply saving a file in tunerpro. So the file MUST br saved first, and then corrected.

If you were to open your file in tunerpro just to check a number or something and then hit save button, you will cause errors to the file.

I noticed this as well.  After checksumming with Nyet's (marvelous) tool, do not save again using Tunerpro or ME7check will pick up that the file now has checksum errors.  This is true at least if MTX is installed but not used, don't know where MTX is not installed.

Should also mention that ME7sum has no trouble correcting the file 'broken' by re-saving, so not a huge issue.