Can I program only the UFM and retain the contents of the CFM in an Intel® MAX® 10 device?

Yes, It is possible to program only the User Flash Memory (UFM) and retain the Configuration Flash memory (CFM) content in Intel® MAX® 10 FPGAs. However, there are some cases where the Intel® Quartus® Prime Programmer will issue a full chip erase. In such a case, the Intel® Quartus® Prime Programmer will raise the warning message below while programming:

Warning (16139): Perform full chip erase and program at device index 1

To avoid Intel® Quartus® Prime Programmer performing a full chip erase of the Intel® MAX® 10 device, ensure:

• The ICB settings of the new POF file match the ICB settings of the previously programmed POF file.
• Verify Protect feature is disabled