By design, the OFT is configured to accept compatible tune files from anyone. That is the entire purpose of the tool: to be open.
If you're having any issue uploading tune files, please read more below.
The file selected is not compliant - This means that the tune file you're attempting to load onto the OFT is NOT compatible with your current ECU/calibration code. I understand that you know the calibration code matches what you see in Openflash Manager compared to what you've downloaded, but there are some situations when the code matches, but the underlying base tune is different.
OpenFlash Manager is intelligent enough to recognize this difference, and reject the tune file due to the risk of bricking or failing your ECU.
Please contact us via the contact form on our site for assistance if you find yourself having this issue.